Which protocol is commonly used for secure communication over the Internet?

• A. HTTP
• B. FTP
• C. HTTPS
• D. SMTP

Answer: (C)

The protocol commonly used for secure communication over the Internet is HTTPS. This protocol is an extension of HTTP and is specifically designed to provide a secure channel over a computer network. It utilizes encryption protocols such as TLS (Transport Layer Security) or SSL (Secure Sockets Layer) to secure data transmitted between the web server and the client, ensuring confidentiality, integrity, and authenticity of the data exchanged.

Using HTTPS means that any sensitive information, such as credit card details or personal data shared online, is encrypted, making it much more difficult for unauthorized parties to intercept and read the data. This added layer of security is essential for protecting users during online transactions, especially on e-commerce sites or platforms that handle sensitive information.

In contrast, other protocols like HTTP do not provide encryption, rendering the data vulnerable to eavesdropping. FTP is primarily used for transferring files and does not inherently ensure secure communication, although secure variants like FTPS exist. SMTP is utilized for sending emails and, while it can be secured with additional protocols, it does not provide secure communication as a default. Thus, HTTPS is the established standard for secure online communication.