Fourth-generation language often abbreviated 4GL, fourth-generation languages are programming languages closer to human languages than typical high-level programming languages. Most 4GLs are used to access databases. For example, a typical 4GL command is
FIND ALL RECORDS WHERE NAME IS "SMITH"

The other four generations of computer languages are

first generation: machine language
second generation: assembly language
third generation: high-level programming languages, such as C, C++, and Java.
fifth generation: languages used for artificial intelligence and neural networks.

From http://www.webopedia.com/

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