Gourav Vallabh explains how CAA and NRC are linked

The 'National Register of Citizens (NRC) is a registry maintained by the Government of India containing names & certain relevant information for identification of Indian citizens of the Assam state. The register was specifically made for Assam state. 

CAA is the newly-enacted law which has been facing protests from various groups in India, allows for citizenship to Hindus, Christians, Buddhists, sikhs and Jains from Pakistan, Bangladesh and Afghanistan.