Concepts transfer between languages
Variables, functions, data structures, testing and complexity matter in Python, Java, C, C++ and JavaScript even when syntax differs.
Programming Glossary: 100+ Coding and Software Development Terms
Explore 100+ programming terms covering algorithms, Python, Java, C, C++, JavaScript, testing, APIs, software design and developer workflows.
A USEFUL MENTAL MODELLearn the language.
Learn the language.
Understand the system.
Programming vocabulary describes more than syntax. It includes the structures used to represent information, the control flow that changes it, the interfaces that connect components and the practices that keep software testable. Use this glossary to understand how individual language features fit into dependable software.
Correct code is only the beginning
Readable boundaries, validation, tests and version control make behaviour safer to change.
Choose structures deliberately
Arrays, maps, trees, queues and classes each make some operations easier and others more expensive.
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109 termsClear definitions · Relevant learning paths
Abstract class
A class intended for extension that may define shared behaviour and incomplete methods.
Abstraction
The practice of exposing essential behaviour while hiding unnecessary implementation details.
Access modifier
A keyword that controls where a class member or type can be used.
Algorithm
A finite sequence of steps for solving a problem or producing a result from an input.
Algorithmic complexity
The growth of time or memory requirements as problem size changes.
Application programming interface (API)
A defined way for software components to request data or behaviour from one another.
Array
A fixed or indexed collection of elements accessed by position.
Arrow function
A concise JavaScript function expression with lexical this binding.
Asynchronous programming
A model that lets work progress without blocking while another operation completes.
Binary search
An ordered-search algorithm that repeatedly eliminates half of the remaining range.
Binary tree
A hierarchical data structure where each node has at most two children.
Boolean
A data type representing the logical values true and false.
Breakpoint
A debugger marker that pauses execution at a selected line or condition.
Build system
Tools and rules that compile, test, package and prepare software artefacts.
Bytecode
An intermediate instruction format executed or translated by a virtual machine.
Cache
A faster temporary store for data or results likely to be reused.
Callback
A function passed to other code for later execution.
Class
A definition describing the state and behaviour of related objects.
Closure
A function bundled with access to variables from its surrounding lexical scope.
Code review
A structured examination of code changes for correctness, clarity and maintainability.
Cohesion
The degree to which responsibilities within a module belong together.
Command-line interface (CLI)
A text-based interface for issuing commands and receiving program output.
Compiler
Software that translates source code into another form, commonly machine code or an intermediate representation.
Concurrency
The organisation of multiple tasks so their progress can overlap.
Conditional statement
A control structure that chooses which code executes based on a condition.
Constant
A named binding intended not to be reassigned after definition.
Constructor
A special operation used to initialise a newly created object.
Coroutine
A computation that can suspend and resume while preserving its state.
Coupling
The degree of dependency between software modules or components.
Data structure
An organisation of data chosen to support particular operations efficiently.
Deadlock
A state where tasks wait indefinitely for resources held by one another.
Debugger
A tool for pausing, inspecting and stepping through program execution.
Dependency
External code or a component that another part of a program requires.
Dependency injection
Supplying a component's dependencies from outside instead of constructing them internally.
Deployment pipeline
An automated sequence for building, testing and releasing software changes.
Design pattern
A reusable approach to a recurring software design problem.
Dynamic typing
Determining and checking value types primarily while a program runs.
Encapsulation
Keeping state and implementation behind a controlled public interface.
Enumeration
A type containing a fixed set of named values.
Event loop
A runtime mechanism that schedules callbacks and asynchronous work from queues.
Exception
A structured signal that normal execution encountered an error or unusual condition.
Expression
A combination of values and operations that produces a result.
Framework
A reusable application structure that calls developer code within defined conventions.
Function
A named, reusable unit of code that accepts inputs, performs a responsibility and may return a result.
Functional programming
A style emphasising functions, composition and controlled state changes.
Garbage collection
Automatic detection and recovery of memory no longer reachable by a program.
Generic programming
Writing algorithms and structures that operate safely across multiple types.
Git
A distributed version-control system for recording and coordinating changes.
Hash map
A key-value data structure that uses hashing for efficient lookup.
Heap memory
A region used for dynamically allocated values whose lifetime is managed explicitly or automatically.
Immutable value
A value whose state cannot be changed after creation.
Inheritance
An object-oriented mechanism for deriving a type from an existing type.
Input validation
Checking external data against required type, format, range and business rules.
Integrated development environment (IDE)
A coding application combining editing, execution, navigation and debugging tools.
Integration test
An automated check that multiple components work together correctly.
Interface
A defined contract describing operations a type or component must provide.
Interpreter
Software that executes source or intermediate instructions without a separate native compilation step.
Iteration
Repeated execution over a sequence, collection or condition.
Java Virtual Machine (JVM)
The runtime environment that executes Java bytecode across supported operating systems.
JSON parsing
Converting JSON text into values a program can validate and use.
Lambda function
A compact unnamed function used where behaviour is needed as a value.
Library
Reusable code that an application calls to perform related tasks.
Linked list
A sequence of nodes connected through references rather than contiguous positions.
Loop
A control structure that repeats a block while a condition or sequence requires it.
Memory allocation
The reservation of memory for values or data structures during execution.
Memory leak
Memory that remains allocated after a program no longer needs it.
Method
A function associated with a class or object.
Mock object
A controlled test substitute that records or simulates component interactions.
Module
A named unit that groups related code and exposes selected responsibilities.
Multithreading
Executing multiple threads within a process to overlap or parallelise work.
Namespace
A named scope that prevents identifier collisions and organises code.
Null pointer
A pointer or reference that does not currently identify a valid object.
Object
A runtime value combining state with behaviour defined by its type or prototype.
Object-oriented programming
A programming approach that organises data and behaviour into objects with defined responsibilities.
Operator
A symbol or keyword that performs an operation on one or more values.
Package
A distributable or organisational collection of related modules and metadata.
Parameter passing
The mechanism used to supply values or references to a function.
Pointer
A value that stores the memory address of another value or object.
Polymorphism
The ability to use a common interface with values that provide different implementations.
Queue
A collection that normally removes items in the order they were added.
Race condition
Behaviour that depends incorrectly on the timing of concurrent operations.
Recursion
A technique where a function solves a problem by calling itself on smaller cases.
Refactoring
Improving code structure without intentionally changing observable behaviour.
Regular expression
A compact pattern language for matching and transforming text.
Repository
A version-controlled location containing code, history and related project files.
REST API
An HTTP interface organised around resources, representations and standard methods.
Return value
The result a function provides to its caller.
Runtime
The environment and supporting services in which a program executes.
Runtime complexity
How an algorithm's execution cost grows as its input size increases.
Scope
The region where a name is visible and can be referenced.
Semantic versioning
A version-number convention communicating breaking, feature and fix changes.
Serialisation
Converting a value into a format suitable for storage or transmission.
Software architecture
The high-level structure, boundaries and significant decisions of a software system.
Software development kit (SDK)
Tools, libraries and documentation for building against a platform or service.
Source code
Human-readable instructions written in a programming language.
Stack
A last-in, first-out structure also used to manage function calls and local values.
State management
The organisation and controlled updating of data that influences application behaviour.
Static typing
Checking variable and expression types before or during compilation.
String
A sequence of characters representing text.
Syntax
The grammatical rules determining how valid code is written.
Test case
A defined input, condition and expected result used to check behaviour.
Type inference
Automatic deduction of expression or variable types from context.
Type system
Rules governing which values and operations are valid in a language.
Uniform resource identifier (URI)
A standard-form identifier used to name or locate a resource.
Unit test
An automated check of a small, isolated behaviour or responsibility.
Variable
A named reference to a value that a program can read or update.
Version control
A system for recording, comparing and coordinating changes to code and related files.
Web framework
A framework providing conventions and components for building web applications.
WebSocket
A persistent two-way communication channel established over a web connection.
Questions about programming vocabulary.
What programming terms should a beginner know?+
Begin with variable, data type, expression, conditional, loop, function, array, object, error, test and version control.
Do programming concepts transfer between languages?+
Yes. Problem decomposition, data structures, control flow, functions, testing and debugging transfer strongly even when each language expresses them differently.
Which programming language should I learn first?+
Python is approachable for general problem-solving, Java for structured object-oriented development, C for memory fundamentals and JavaScript for interactive web applications.
FROM DEFINITION TO PRACTICE
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