Network protocols ensure communication between devices by establishing standard rules for data transmission and reception. These protocols, such as TCP/IP (Transmission Control Protocol/Internet Protocol) and HTTP (Hypertext Transfer Protocol), define how data packets are formatted, transmitted, and processed. By adhering to these protocols, devices can communicate effectively, regardless of manufacturer or location. Protocols ensure data integrity, synchronization, and reliable connections, which are essential for various applications, including web browsing, file sharing, and real-time communications over the internet.