TCP/IP, or Transmission Control Protocol/Internet Protocol, is a set of communications protocols used to connect hosts on the Internet or a network. It is the primary set of protocols used to connect computers to the Internet. TCP/IP is responsible for ensuring that data is correctly formatted, addressed, transmitted, routed, and received.
For example, when you type a website address into your browser, the browser uses the TCP/IP protocol to connect to the website’s server. Once connected, the browser sends a request for the web page, which the server then sends back to the browser. The browser then displays the page on your screen.