What is DTLS – Datagram Transport Layer Security?

Datagram Transport Layer Security (DTLS), is a protocol designed to provide communications privacy. Based on the Transport Layer Security (TLS), DTLS allows client/server applications to communicate in a secure way preventing tampering, eavesdropping and message forgery.

DTLS, just like SRTP is one of the security protocols used for the WebRTC technology.

Further reading:

DTLS is defined in RFC 6347