I understand that people don't like Valorant that much, either because of its bugs or because of the positioning, but admit it, it's an entertaining and very competitive game that provides you with many hours of play and some stress.
Valorant is a first-person game where the main objective is to kill the enemies, whether you are the defender or the attacker. When it's your turn to be the defender, you must defend your sites, whether A, B, or even some maps have a third site, which is C. When you are the defender, you win by killing the entire enemy team or deactivating the bomb before it explodes. It's almost the same as the attacking side. The only difference is that you must try to make your bomb explode without your entire team dying in the attempt.