# Access Query Language

The Access Query Language (AQL) is a D3 facility used to
retrieve and output data. It is an original component of the D3
system and consists of the List pre-processor, the Select
processor, and the Output processor. AQL is a system-level
information retrieval language that allows users to query their
database without writing complex programs.

AQL is a report-generating language that enables you to make various types of listings and
 queries. It is also used to select items from a file for use by other
 processors.

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Source: https://d3codex.com/access/access-query-language/ - part of the D3Codex reference.