The standard TCP port used by HTTPS is 443.
HTTPS is HTTP carried over a secure connection using TLS, historically also known as SSL. When a browser connects to a website using an address beginning with “https://,” it normally contacts the server on TCP port 443 rather than the traditional HTTP port 80.
Port numbers identify services at the transport layer, but a port number alone does not guarantee security. A service can technically run HTTPS on another port, and an administrator can configure other software to listen on 443. The usual pairing of HTTPS with 443 is a convention that helps clients and servers find the expected service automatically.
TLS provides encryption, integrity protection, and authentication through digital certificates. HTTPS therefore protects data in transit, but it does not automatically make a website trustworthy, remove malware, or protect information after it reaches the server. Those distinctions are common sources of confusion when people interpret the padlock shown by browsers.