What two message types are exchanged during the DHCP lease renewal process?

During the DHCP lease renewal process, two key message types are exchanged: the DHCP Request and DHCP Acknowledgment (ACK). The client sends a DHCP Request to the server to indicate its desire to renew the lease for its IP address. In response, the server sends a DHCP ACK to confirm the renewal, allowing the client to continue using the same IP address for an extended period.