In what cases is it advisable to use UDP protocol instead of TCP?

UDP (User Datagram Protocol) is suitable for use cases where speed of data transmission is important and packet loss is acceptable, as well as when there is no need to establish a connection and guarantee delivery, as implemented in TCP. Examples of such cases:

• Video streaming and audio conferencing, where latency is critical and the loss of some packets does not significantly affect quality.
• Online gaming, where minimal latency is important and retransmitting lost packets could worsen the gaming experience.
• Discovery and monitoring protocols, where simplicity and transmission speed are important.

In Go, the net package is used for working with UDP, for example:

conn, err := net.DialUDP("udp", nil, udpAddr)
if err != nil {
    // error handling
}
_, err = conn.Write([]byte("data"))

Thus, UDP is chosen when performance and low latency are important, rather than transmission reliability.