Data transmission refers to the process of sending and receiving data between devices over a communication medium. This can occur through various methods, including wired connections like Ethernet or wireless technologies such as Wi-Fi and Bluetooth. The efficiency and speed of data transmission are crucial for applications ranging from simple file transfers to complex streaming services. Different protocols govern how data is transmitted, ensuring that it arrives accurately and in the correct order. Common protocols include TCP/IP for internet communication and HTTP for web browsing. Understanding these protocols helps in optimizing data transmission for better performance and reliability.