A third-generation language (3GL) is a programming language designed to be easier for a human to understand, including things like named variables, abstract data types, and algebraic expression syntax. Another crucial difference compared to second-generation programming languages was abstraction away from the underlying processor. A fragment might be:

let b = c + 2 * d

First introduced in the late 1950s, Fortran, ALGOL and COBOL are early examples of this sort of language. Most "modern" languages (BASIC, C, C++, Delphi, and Java) are also third-generation languages. Most 3GLs support structured programming.

Reference:
http://en.wikipedia.org/wiki/Third-generation_programming_language

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