In siege there are three main game modes. Hostage, Secure the Area, and Bomb. In each game mode at the start of the game you are given three minutes to fortify the area. this is called the preperation phase and allows the defenders to set up and prepare for the attackers.
Hostage-
In Hostage your objective for attack is to extract the hostage from the designated room to outside of the map, but you can also win by eliminating the whole enemy team before the time expires. For defence it is viceversa protect the hostage and stay alive until the time runs out, you can also win by eliminating the enemy team as well
Secure the Area-
In Secure the area your objective as an attacker is to defend the designated room and stop any attackers from gaining access to it until the time runs out, you can also win the game by eliminating the enemy team. for attackers its the opposite. Gain access to the room and secure it by staying in the room without any enemies in the room at the same time as you for atleast 10 consecutive seconds.
Bomb-
In bomb your objective as an attacker is to locate one of two bombs and plant the defuser before the time runs out and protect it for atleast 45 seconds. this is the only way to win as an attacker in this game mode. Even if you eliminate all the enemies, if the bomb is not planted before the timer runs out you lose the round. As a defender your pbjective is to defend the two bombs from the attackers and stop them from defusing them bomb in order to win the round. If the defuser is planted you have 45 seconds to disarm the defuser, if disarmed you win the round, however if you fail to disarm it then the round is lost. If the defuser is planted and then you wipe out the enemy team you still have to deactivate the defuser before the time expires.
Casual v.s Ranked
Casual and Ranked are two sides of the same coin. In casual there is no penalty for losing, you play however you want. If you want to be a sweaty trigger trash nerd and go try hard then go ahead. Or if you want to just have a vhill laid back game with some friends like its suppose to be played then be my guest. playing casual you earn in game curency called "Renown". You also gain experience to level up.
Ranked is a wole diffrent story. In ranked you are compeating in a sweat fest. The penalty for losing is getting deranked and the reward for winning is gaining elo to rank up. The ranking system is as follows, at the very bottom there are the coppers. It is the lowest rank group in the game, it goes copper 4-3-2-1 then bronze 4-3-2-1 same goes for silver, gold, platnum, dimond, and the newst rank champion. since the games can be very intence. This can lead to broken conrollers, keyboards, mice. monitors.TV's etc. as you rank up the harder it gets.