Vim's tag navigation feature allows quickly jumping to function, class, variable definitions in code. Generating tags: ctags -R . to recursively generate tag files for current directory. Tag file: generates tags file by default, containing definition locations of all symbols. Tag commands: :tag name to jump to tag definition, Ctrl+] to jump to definition of word under cursor, Ctrl+t to return to previous tag, :tnext for next tag, :tprev for previous tag, :tfirst for first tag, :tlast for last tag, :tselect to select tag. Tag list: :tags to view tag stack. Tag settings: :set tags+=path/to/tags to add tag file path. Tag navigation is very useful for reading code in large projects, understanding code structure, and quickly locating definitions, and is an important tool for Vim development.