AAID stands for Android Advertising ID, a unique identifier assigned to each Android device by Google. It is used for advertising and analytics purposes, allowing app developers and advertisers to track user activity and deliver personalized ads. Unlike other identifiers, such as IMEI or MAC address, AAID can be reset or disabled by the user, giving them more control over their privacy. However, it is important to note that AAID does not reveal any personal information and is only used for advertising and analytics purposes.