There's this map, really long path, the terrorists spawn at one end and have to make it to the other end to plant the bomb, there's lots of cover and cubes and rectangles and what not making a sort of maze to give them cover from the ct's who are above a giant tower wall above the bombsite and cannot come down. The CT's only can awp the t's and the map is meant to be played with auto-bunnyhop so the t's have a chance to make it to the bombsite.
If the t's plant the bomb then cts cannot come down and defuse so the t's win.