The best affiliate marketing websites offer robust programs with high commission rates, a wide range of products or services to promote, and reliable tracking systems. Popular platforms include Amazon Associates, which provides access to a vast product range; ShareASale, known for its diverse merchant options; and ClickBank, which specializes in digital products. These websites are favored by affiliates for their ease of use, comprehensive support, and timely payouts, making them ideal for both beginners and experienced marketers looking to earn online.