View mode is a minor mode that lets you scan a buffer by sequential screenfuls. It provides commands for scrolling through the buffer conveniently but not for changing it. Apart from the usual Emacs cursor motion commands, you can type <SPC> to scroll forward one windowful, <S-<SPC>> or <DEL> to scroll backward, and s to start an incremental search.
Typing q (
View-quit) disables View mode, and switches
back to the buffer and position before View mode was enabled. Typing
View-exit) disables View mode, keeping the current
buffer and position.
M-x view-buffer prompts for an existing Emacs buffer, switches to it, and enables View mode. M-x view-file prompts for a file and visits it with View mode enabled.