Which protocol is primarily used for web traffic?

HTTP, or Hypertext Transfer Protocol, is the primary protocol used for transmitting web traffic over the Internet. It is designed for the communication between web browsers and servers, allowing users to access and interact with web pages. When you enter a URL in your browser, it uses HTTP to send requests to web servers, which then respond with the requested resources, like HTML files, images, and other content.

In contrast, FTP (File Transfer Protocol) is used specifically for transferring files, while SMTP (Simple Mail Transfer Protocol) is the protocol for sending emails. DNS (Domain Name System) translates domain names into IP addresses but does not handle web traffic itself. Therefore, HTTP is uniquely suited for web traffic due to its design and functionality, making it the correct answer.