What are the two protocols/types of protocol that ensures the transmission of data packets across a network or networks and will resend the packet if its arrival is not acknowledged?

There are two types of protocols: connection-oriented, which ensures delivery, and connectionless, which does not. For tasks like streaming, where a missed packet here and there is less important than continuing to send the information, connectionless protocols are utilized. When each packet must arrive, connection-oriented protocols are utilized. TCP, HTTPS, and SSH are a few connection-oriented protocols, while connectionless protocols include UDP, DHCP, and TFTP.