BIL, which stands for Biometrics Instruction Letter, is an official letter issued by immigration authorities that requests an individual to provide their biometric information within a specified timeframe. Biometrics typically include fingerprints and photographs, and the collection of this data is a standard part of the immigration and visa application process in many countries.

The BIL serves as a notification to the applicant, outlining the requirement to visit a designated location (such as a visa application center) to have their biometrics recorded. It includes details such as the deadline for compliance, the necessary documents to bring, and the location where the biometrics should be submitted.
The purpose of the BIL is to ensure that the applicant’s biometric data is collected and linked to their immigration or visa application, aiding in identity verification and security checks as part of the overall assessment process.