I heard some trombonists at my school talking about how much they dislike tenor clef. What IS tenor clef?

Tenor clef is just another way to read and write music. I think its just to make people who play a song witha lot of high notes easier for them because they put the high notes in the staff and not above it. Its like a different way of looking at music. It is kind of hard at first but you can eventaully get it and it becomes very useful.