DTLS 1.3 (Datagram Transport Layer Security) adapts TLS 1.3 to datagram transports such as UDP, where packets may be lost, duplicated, or arrive out of order. It provides encryption, authentication, and integrity while accommodating those unreliable network conditions.
DTLS matters in systems that need secure, low-latency communication over datagrams, including some real-time and networked applications. In attacks, an insecure or incorrectly configured DTLS deployment can expose communications or enable protocol-level disruption; defenders should keep implementations updated, validate peer authentication and version negotiation, and test interoperability and packet-loss behavior. A library supporting DTLS 1.3 does not mean an application uses it: deployment depends on configuration, application code, and compatible peers.