Final answer:
Automatic source routing in TCP/IP networking allows the source computer to determine the best path for data transmission in real-time, optimizing network traffic.
Step-by-step explanation:
Automatic source routing in TCP/IP networking refers to the capability of the source computer to determine the best path for data transmission in real-time, optimizing network traffic. It allows the source computer to dynamically choose the most efficient route based on current network conditions. This feature is commonly used in protocols like Routing Information Protocol (RIP) and Border Gateway Protocol (BGP) to ensure efficient and reliable data transmission.