Algol(1960) :

• ALGOL is a High-Level language invented by the International Group in 1960.
• It was the 1st language to follow the Structure Programming Concept.
• This language become more famous in Europe but not that much in the US.

BCPL (1967):

• Taking forward the concept of ALGOL, Martin Richards has invented BCPL (Basic Combined Programming Language) in 1967.
• Both languages were simply used for Academic purposes.

B (1970):

• Ken Thompson in the year 1970 had invented the language call B.
• It was also called as Simple B language. He had developed this language by taking forward the concepts of BCPL.
• This was also mainly used for Academic purposes

Traditional C (1972):

• The first version of C was developed by Dennis Ritchie at Bell Labs and was used to rewrite the Unix operating system and its utilities.

C or C89 (1989):

• The ISO standard for C was often referred to as "C89".

ANSI/ISO C (1990):

• In 1990, the ISO C standard was updated to include new features, such as improved type checking, function prototypes, and improved memory management.
• This updated version of the standard is often referred to as "ANSI/ISO C."

C11 (2011):

• In 2011, the ISO C standard was updated again, adding new features such as multi-threading support and atomic operations.
• This version of the standard is often referred to as "C11."

C17 (2018):

• The ISO C standard was updated again in 2018, adding new features such as improved support for multithreading and improved memory safety.
• This version of the standard is often referred to as "C17."