By default many browsers do provide users with the option to save single webpages to your desktop, however this option is not available when you want to download entire websites and save them on your computer .
HTTrack is a freeware offline browser utility that will allow you to download a entire website including html pages, images and other files and access it offline.
HTTrack recursively downloads all directories, getting HTML, images, and other files from the server to your computer. HTTrack arranges the original site’s relative link-structure. Simply open a page of the "mirrored" website in your browser, and you can browse the site from link to link, as if you were viewing it online. HTTrack can also update an existing mirrored site, and resume interrupted downloads.
HTTrack is available for download for Windows 95/98/NT/2K/XP and Linux based operating systems. Definitely useful for people who want to browse websites on the move when there is no Internet connection available.