<document, text, programming> Space and/or tab characters added at the beginning of one or more consecutive lines to indicate the structure of a piece of text, e.g. indenting a passage to make it stand out.
Indentation is important in source code for readability. See indent style. Some programming languages go further and use indentation as the main method to represent block structure to the compiler or interpreter, see off-side rule.
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Nearby terms: Incremental Prototyping Technology for Embedded Realtime Systems « [incr Tcl] « indent « indentation » indent style » Independent Computing Architecture » Independent Logical File