Editing State diagram (section)

{{Short description|Diagram of behavior of finite state systems}}
{{Use American English|date = April 2019}}
{{Use dmy dates|date=November 2020}}
[[Image:Finite state machine example with comments.svg|thumb|225px|right|A state diagram for a door that can only be opened and closed]]

A '''state diagram''' is used in [[computer science]] and related fields to describe the behavior of systems. State diagrams require that the system is composed of a finite number of [[state (computer science)|state]]s. Sometimes, this is indeed the case, while at other times this is a reasonable [[abstraction (computer science)|abstraction]]. Many forms of state diagrams exist, which differ slightly and have different [[Semantics#Computer science|semantics]].