Cookies are small bits of data stored on devices (computer, mobile phone, tablet, etc.) that recognize users. Each cookie expires after a certain period depending on what it's used for. The system uses cookies for all areas where a log in is required and on surveys in order for a survey site to operate correctly. For example, we use cookies to authenticate you. When you open a survey, authentication cookies are set, which let us know who you are when responding to our surveys.