When is the UDP protocol used?

The UDP protocol (User Datagram Protocol) is used in cases where data transfer speed is critical, and guaranteed delivery or packet order is not. Examples:

• Streaming video and audio: Small packet loss is preferable to delays caused by retransmission.
• Online gaming: Fast data exchange between client and server to minimize latency.
• DNS (Domain Name System): Requests and responses are usually small, and speed is important for resolving domain names.
• VoIP (Voice over IP): Transmission of voice data where minimal delay is crucial.
• SNMP (Simple Network Management Protocol): Managing network devices, where requests and responses are small.
• DHCP (Dynamic Host Configuration Protocol): Obtaining IP addresses and other network settings.
• NTP (Network Time Protocol): Synchronizing time between systems.

In these scenarios, the disadvantages of UDP, such as lack of delivery guarantee, order control, and reliability mechanisms like TCP, are offset by its advantages: low latency and minimal overhead.