HTTP/3 is the latest version of the Hypertext Transfer Protocol, which is used for transferring data on the web. It builds on the previous version, HTTP/2, but introduces a new transport layer called QUIC. This change allows for faster and more reliable connections, especially in situations with high latency or packet loss. One of the key features of HTTP/3 is its ability to establish connections more quickly than earlier versions. It also improves security by encrypting data by default. Overall, HTTP/3 aims to enhance the performance and efficiency of web communications, making browsing smoother for users.