What is glee? Is it porn?

So, I was at my friends house, and we were working on a book report. We took turns working on the computer, and the other would look through the book for more info. I was peeking in the computer room when he closed a window really quick, and opened the window with the report. All I saw in the tab bar was 'Glee Season 1" I tried loading that, but it would not load. What is 'Glee'? It really sounds like porn, what is it? Is it any good?