Casinos use sweep coins as a form of virtual currency that allows players to participate in online gaming without using real money. These coins can be purchased or acquired through various methods and offer a way to enjoy casino games without the risk of losing actual funds. Sweep coins are often used in social casinos and online gaming platforms as a way to provide entertainment and engagement. Players can redeem sweep coins for prizes, rewards, or additional gameplay opportunities within the casino environment. Overall, sweep coins offer a fun and interactive way to experience casino games without the financial commitment.