TCP/IP stands for Transmission Control Protocol/Internet Protocol. It is a set of rules that governs how data is sent and received over the internet. Think of it as a postal system for digital information, ensuring that messages reach their destination accurately and in the right order. The TCP part breaks data into smaller packets, while IP addresses these packets to ensure they arrive at the correct location. Together, they enable devices like computers and smartphones to communicate seamlessly, allowing us to browse websites, send emails, and stream videos effortlessly.