DTLS stands for Datagram Transport Layer Security.
Simply put, DTLS is UDP + security.
What is DTLS?
DTLS provides similar security guarantees to that TLS provides.
DTLS is used in WebRTC for secure media key exchange in DTLS-SRTP.
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The WebRTC Glossary is an ongoing project where users can learn more about WebRTC related terms. It is maintained by Tsahi Levent-Levi of BlogGeek.me.