The C programming language

C is a general-purpose high-level programming language suitable for low-level programming, in other words: a system programming language.

It stands out in terms of portability, interoperability, efficiency, and stability.

Revisions of the C standard
C23	ISO/IEC 9899:2024	ISO / IEC 2024-10-31	N3220 2024-02-22
C17	ISO/IEC 9899:2018	ISO / IEC 2018-07-05	N2310 2018-11-11
C11	ISO/IEC 9899:2011	ISO / IEC 2011-12-08	N1570 2011-04-04
C99	ISO/IEC 9899:1999	ISO / IEC 1999-12-16	N1256 2007-09-07
C95	ISO/IEC 9899:1990 /Amd 1:1995	ISO / IEC 1995-03-30
C90	ISO/IEC 9899:1990	ISO / IEC 1990-12-20
C89	ANSI X3.159-1989
K&R	The C Programming Language

See also:

analogous table on committee's website (includes also upcoming revision),
revisions section in resources, where we list additional references and documents.