Udyam registration
The government's free registration for micro, small and medium enterprises, which banks and schemes ask for.
Udyam registration gives a business a certificate saying it is an MSME, and which size class it falls in. It is not compulsory, but most scheme loans and many bank products ask for it, and some government purchasing and payment protections only apply to registered MSMEs.
It is free on the government portal and takes minutes with an Aadhaar-linked mobile. Sites that charge for it are not the government.
Learn it in a lesson
See also: MSME, MUDRA loan