The 'ls' command is commonly used to list files and directories in Linux. When used with certain options, such as the '-l' (long format) or '-F' (classify) options, the 'ls' command can provide hints about the file types. The '-l' option displays detailed information, including the file type indicated by a symbol before the filename (e.g., "d" for directories, "-" for regular files). The '-F' option adds specific symbols to filenames, such as "/" for directories or "@" for symbolic links.