Vim What?Commands%
%

The % command in Vim

Motion

goto match

Jump to the matching bracket, paren, or brace under/after the cursor. With a count (e.g. 50%), jump to that percentage of the file. Enable matchit (built-in, not loaded by default) with :packadd matchit for HTML/XML tag and if/end matching.
Examples
Related plugin

andymass/vim-matchup — Extends % to match if/else/end, HTML/XML tags, and language-specific block pairs. Drop-in replacement for the built-in matchit.

Reference

Official Vim help for %

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Related motions