TCP is used by HTTP, HTTPs, FTP, SMTP and Telnet. UDP is used by DNS, DHCP, TFTP, SNMP, RIP, and VoIP. The TCP connection is a byte stream. UDP connection is message stream.

Does HTTP use TCP or UDP?

HTTP and connections

Among the two most common transport protocols on the Internet, TCP is reliable and UDP isn't. HTTP therefore relies on the TCP standard, which is connection-based.

Is HTTPS part of TCP?

HTTPS is an application layer protocol in the four-layer TCP/IP model and in the seven-layer open system interconnection model, or what's known as the OSI model for short.