What is the term for the lines on the system bus that the CPU uses to send and receive data?

The term for the lines on the system bus that the CPU uses to send and receive data is indeed the "data bus." The data bus is a crucial component of a computer's architecture, as it is responsible for transferring the actual data between the CPU, memory, and other components of the system. The data bus allows for the bi-directional flow of data; it carries information from the CPU to other parts of the system as well as data back to the CPU from those parts.

The data bus is distinct from other buses within a computer system, such as the control bus and address bus. The control bus carries control signals to manage and coordinate the operations of the computer, while the address bus is responsible for specifying the addresses of the memory locations that the CPU wants to read from or write to. The data path, often used as a term in discussions about the overall flow of data within a system, refers to the channels through which data moves but is not specifically referred to as a bus like the data, control, or address buses are.