Orweb is a companion browser to https://f-droid.org/packages/org.torproject.android, the port of Tor to Android. Orbot anonymizes internet traffic by routing it through many different stages and you must have that enabled first, though root isn't needed. Orweb disables certain other browser features that could be used to identify you. Please note that Orweb is superseded by https://f-droid.org/packages/info.guardianproject.orfox, available from the <a href="https://guardianproject.info/fdroid/repo/">Guardian Project repo</a>. Orweb is no longer maintained at all.