A Registration Authority (RA) is an entity responsible for accepting and verifying requests for digital certificates. It acts as a mediator between users and a Certificate Authority (CA), ensuring that the identity of the requester is legitimate before a certificate is issued. This process helps maintain the integrity and security of digital communications. RAs play a crucial role in the broader framework of Public Key Infrastructure (PKI). They help manage the lifecycle of digital certificates, including their issuance, renewal, and revocation. By doing so, RAs contribute to the trustworthiness of online transactions and communications, safeguarding sensitive information.