The User Datagram Protocol (UDP) is a transport-layer network protocol that offers fast, lightweight, and connectionless data transmission. Unlike connection-oriented protocols, UDP operates without connection handshakes, reception acknowledgments, or packet retransmissions. It transmits data packets immediately without guaranteeing successful delivery, packet sequencing, or protection against loss, making it optimal for time-critical applications—such as live video streaming, voice calls, and online gaming—where speed and timeliness take priority over complete accuracy.