Program

Definitions by domain

• Computing: a sequence of coded instructions written in one or more programming languages that a computer can execute to perform tasks. A program may be a small script, a command-line tool, or a large application or operating system.
• Broadcasting and events: a planned lineup of content, including order, duration, and credits, for radio, television, theatre, or conferences.
• Education and training: an organized curriculum or set of courses leading to learning objectives or qualifications.
• Public policy and services: a coordinated set of activities, resources and rules designed to address a societal need, often with measurable objectives and evaluation.

Structure and components

Despite domain differences, programs share common elements: goals or specifications, sequences or schedules, inputs and outputs, and mechanisms for monitoring or control. In software, typical components include source code, libraries, configuration, user interfaces and data. In policy or education, components include objectives, target populations, resources, timelines and assessment methods.

Creation and lifecycle

Program development follows stages such as planning and specification, design, implementation, testing or piloting, deployment, and maintenance or evaluation. In computing these stages map to requirements analysis, coding, debugging, release and ongoing updates. In public programs, evaluation and adaptation are essential to ensure effectiveness and accountability.

Types and distinctions

• By size: scripts and utilities are generally small; applications and systems are larger and more complex.
• By execution: compiled programs are translated to machine code before running, while interpreted programs are executed by an interpreter at runtime.
• Related concepts: an algorithm is a step-by-step method; a program is an implementation of one or more algorithms. A process is a program in execution.

Distribution, licensing and maintenance

Programs are distributed in many forms: source code, executable binaries, packaged installations, or online services. Legal and practical considerations include licensing, intellectual property, compatibility, security, and the need for updates and support. Well-maintained programs include documentation, versioning and testing practices to ensure reliability and safety.