Transmission protocols are sets of rules that determine how data is transmitted over a network. They ensure that information is sent and received accurately between devices, such as computers and servers. Common examples of transmission protocols include TCP (Transmission Control Protocol) and UDP (User Datagram Protocol), each serving different purposes in data communication. These protocols manage various aspects of data transfer, including error checking, data integrity, and flow control. By establishing a standard way for devices to communicate, transmission protocols enable seamless interactions across the internet and local networks, facilitating activities like web browsing, file sharing, and online gaming.