Is there a difference between prequel and reboot?

Answer 1

Prequel: A work that supplements a previously completed one, and has an earlier time setting. These can often avoid the plot problems associated with having to deal with the consequences of the original (e.g. the death of an important character). However, they pose the challenge of maintaining dramatic interest when the outcome is already known from the original work, so the focus is usually on the character interactions or revealing how the characters and situations of the original work developed.

Reboot: The verb reboot, in media dealing with serial fiction, means to discard much or even all previous continuity in the series and start anew with fresh ideas. Effectively, the writer(s) declare all established fictive history to be irrelevant to the new storyline, and start the series over as if brand-new.