- Just like [[TCP]], operates at the **Transport Layer (Layer 4)** of the [[OSI Model|OSI model]] and provides end-to-end communication between applications. - No handshake or ack. - Because no 3 way handshake or order validation, is faster/lower latency. - Used for services that require fast or low latency connections. - Faster but less reliable than TCP. - Examples: - Video streaming, gaming, [[DNS]] lookups, DHCP.