Digibeta was introduced in 1993. It uses exact same tape shell as its predecessors. But the playback machines are different than its predecessors.
Digital Betacam is the highest standard of video tape format and used for broadcasting purposes or for applications wherein picture quality required is of highest quality.
Betacam is analogue tape while digibeta is (as the name implies) a digital tape format. Both are 1/2 inch tapes