What should a web address begin with to indicate a secure site?

A web address should begin with HTTPS to indicate a secure site. The "S" at the end of HTTPS stands for "Secure," which means that the data transmitted between the user's web browser and the web server is encrypted using protocols such as SSL (Secure Sockets Layer) or TLS (Transport Layer Security). This encryption helps protect sensitive information, such as personal details and financial data, from being intercepted by malicious actors during transmission.

In contrast, HTTP, without the "S," denotes a standard, unencrypted connection, leaving data vulnerable to eavesdropping. FTP (File Transfer Protocol) is used primarily for transferring files and does not involve web browsing or security in the same manner. The "www." prefix is simply a subdomain that indicates a web service, but it does not in itself convey any information about the security of the site. Therefore, a web address starting with HTTPS is essential for ensuring secure communication between the user and the website.