'''usually requires expertise in several different subjects, including knowledge of theComputer programming''' or '''coding''' is the composition of sequences of instructions, called [[computer program|programs]], that [[computer]]s can follow to perform tasks.<ref>{{cite web|url=http://yearofcodes.tumblr.com/what-is-coding|title=What is coding|last=Bebbington|first=Shaun|year=2014|website=Tumblr|url-status=live|archive-url=https://web.archive.org/web/20200429195646/https://yearofcodes.tumblr.com/what-is-coding|archive-date=2020-04-29|access-date=2014-03-03}}</ref><ref>{{cite web|url=http://yearofcodes.tumblr.com/what-is-programming|title=What is programming|last=Bebbington|first=Shaun|year=2014|website=Tumblr|url-status=live|archive-url=https://web.archive.org/web/20200429195958/https://yearofcodes.tumblr.com/what-is-programming|archive-date=2020-04-29|access-date=2014-03-03}}</ref> It involves designing and implementing [[algorithm]]s, step-by-step specifications of procedures, by writing [[source code|code]] in one or more [[programming language]]s. Programmers typically use [[high-level programming language]]s that are more easily intelligible to humans than [[machine code]], which is directly executed by the [[central processing unit]]. Proficient programming usually requires expertise in several different subjects, including knowledge of the [[Domain (software engineering)|application ___domain]], details of programming languages and generic code [[library (computing)|libraries]], specialized algorithms, and [[Logic#Formal logic|formal logic]].
Auxiliary tasks accompanying and related to programming include [[Requirements analysis|analyzing requirements]], [[Software testing|testing]], [[debugging]] (investigating and fixing problems), implementation of [[Build automation|build systems]], and management of derived [[Artifact (software development)|artifacts]], such as programs' [[machine code]]. While these are sometimes considered programming, often the term ''[[software development]]'' is used for this larger overall process – with the terms ''programming'', ''implementation'', and ''coding'' reserved for the writing and editing of code per se. Sometimes software development is known as ''[[software engineering]]'', especially when it employs [[formal methods]] or follows an [[engineering design process]].
