In 2021, the best betting sites offered a blend of user-friendly interfaces, diverse betting options, and competitive odds. Platforms like Bet365, DraftKings, and FanDuel stood out for their extensive sports coverage and innovative features, including live betting and cash-out options. Many sites also prioritized mobile accessibility, ensuring bettors could place wagers on the go. Additionally, robust security measures and attractive bonuses made these platforms appealing to both novice and experienced gamblers, solidifying their reputation in the ever-evolving online betting landscape.