The Transport Layer Security (TLS) Protocol Version 1.3
New features introduced in TLS 1.3 include:  * smaller latency (0-RTT: zero round-trips support).
  * removes insecure encryption primitives (SHA1, MD5, RC4).
  * elliptic curve support.
  * downgrade protection.

Some interesting reads: https://blog.cloudflare.com/introducing-0-rtt/ and https://www.cloudflare.com/learning-resources/tls-1-3/ .