What is a common port number used by HTTPS?

HTTPS, which stands for Hypertext Transfer Protocol Secure, commonly uses port 443 for secure communication over the internet. This protocol encrypts data exchanged between a web server and a client using SSL/TLS, ensuring privacy and security for sensitive transactions, such as online banking and shopping.

Port 80 is associated with HTTP, which is the unencrypted version of the web protocol. Choosing this port would mean that data is not secure, making it unsuitable for transactions that involve sensitive information.

Port 25 is typically reserved for SMTP (Simple Mail Transfer Protocol), which is used for sending emails. While important for email servers and communication, it is not related to secure web traffic.

Port 53 is used for DNS (Domain Name System) services, which are responsible for resolving domain names into IP addresses. Although crucial for internet functionality, it has no direct role in secure web communication.

Thus, port 443 is the standard for HTTPS, allowing users to securely access websites by ensuring data encryption and integrity during transmission.