IMEI stands for International Mobile Equipment Identity. It is a unique identification number assigned to every mobile device, including smartphones, tablets, and other cellular devices. The IMEI number helps in identifying and tracking individual devices in a mobile network.

IMEI numbers are typically 15 digits long and are used by network providers, law enforcement agencies, and manufacturers to track and block stolen or lost devices. The IMEI number is also used to prevent the use of counterfeit or unauthorized devices on cellular networks.