Probably the most important feature in Windows 8 is the new metro UI start screen along with the the Windows Store which allows you to install modern UI apps. Apart from the Windows Store, Windows 8 comes with many built in or default modern apps. Microsoft calls them Bing apps and these includes weather, travel, finance, news, maps etc. Some of these apps might not be useful for you and also these apps take up unnecessary storage space on your hard disk in case you are on low disk space (case with tablets). Even if you uninstall these apps, they are not completely removed from your Windows OS and they can be recreated from the files stored.