I know its near impossible to win big at casinos, but if you do, how do they pay you so much?

Like hypothetically speaking, if some person hit the jackpot, worth like $100,000, how does the casino pay that to them? I don't imagine that it would be in cash? Also, if you win money, are there ATM machines in the casino that allow you to deposit it into your bank account right away? I have heard of people getting robbed or followed outside of the casino because they had been watched when they were playing. Is there a way to avoid this, like depositing your winnings into your bank inside the casino, or having bodyguards escort you, or what? Please explain. Thanks!