Vim's session management feature can save and restore editing sessions, including open files, window layouts, cursor positions, etc. Saving sessions: :mksession session.vim to save current session to file, :mks! session.vim to force overwrite existing session file. Restoring sessions: :source session.vim to load session file, vim -S session.vim to load session on startup. Session options: :set sessionoptions controls what to save, common options include blank (empty windows), buffers (all buffers), curdir (current directory), folds (fold state), help (help windows), options (options and mappings), resize (window sizes), winsize (window sizes), tabpages (tab pages). Viminfo file: automatically saves command history, search history, register contents, etc., configured via :set viminfo options. Session management is very useful for multi-project development and restoring work state, allowing quick return to previous editing environment.