Some commands don't have man pages or have incomplete man pages and store their information as document form. To view these pages info command is used.
Command info display information in the document format. It is similar to man command with more robustness for linking pages together.
Info pages are made with texinfo tools, can link with other pages and create menus.
The info document's default location is /usr/share/info.
Look at the above snapshot, it gives complete instruction how to move in info page.
To find documented information about a command,
Look at the above snapshot, it shows information about ls command.