What is the difference between an unbeaten streak and a winning streak?

Answer 1

An unbeaten streak is when a team or sportsperson has not lost any match-ups for a specific number of encounters (e.g., Juventus's current forty-six-game non-losing streak as of Oct. 3, 2012) and may include one or more draws. Such a thing is possible, for instance, in soccer during the regular season as well as in the group stage during a tournament of the same but not in the playoffs and knockout stage. It is quite rare in football and Baseball and several others sports and competitions in which a winner or winning team is usually required.

A winning streak is one composed solely of wins and has thus no draws and no losses, such as the Arizona Cardinals 4-0 perfect record as of Week 4 in the National Football League, and the Undertaker's 20-0 winning streak at WrestleMania in professional Wrestling.

It should be noted that all winning streaks are also undefeated streaks, but the other way around is not always the case.

I hope this helps. Have a nice day.