Online survey sites offer users the chance to make money by completing questionnaires and other market research tools. For each completed survey, users earn points. Typically, if a survey taker reaches a certain number of points each month, they can redeem them for cash (usually paid into a PayPal account) or some kind of gift card or token.
Online surveys can cover a vast range of topics. They are similar to focus groups in that companies can use survey services to gather high-quality information on new products.