Function
Function or functionality may refer to:

Computing
Function key, a type of key on computer keyboards
Function model, a structured representation of processes in a system
Function object or functor or functionoid, a concept of object-oriented programming
Function (computer programming), or subroutine, a sequence of instructions within a larger computer program

Music
Function (music), a relationship of a chord to a tonal centre
Function (musician) (born 1973), David Charles Sumner, American techno DJ and producer
"Function" (song), a 2012 song by American rapper E-40 featuring YG, Iamsu! & Problem
"Function", song by Dana Kletter from Boneyard Beach 1995

Other uses
Function (biology), the effect of an activity or process
Function (engineering), a specific action that a system can perform
Function (language), a way of achieving an aim using language
Function (mathematics), a relation that associates an input to a single output
Function (sociology), an activity's role in society
Functionality (chemistry), the presence of functional groups in a molecule
Party or function, a social event
Function Drinks, an American beverage company

See also
Function field (disambiguation)
Function hall
Functional (disambiguation)
Functional group (disambiguation)
Functionalism (disambiguation)
Functor (disambiguation)