What is G-code?

G-code is a standardized programming language specifically designed for controlling CNC (Computer Numerical Control) machines. This language consists of a series of commands that instruct the machine on how to perform various tasks, such as moving the cutting tool along specified axes, controlling the spindle speed, turning the coolant on and off, and executing complex machining operations. Each command corresponds to a specific action, allowing for precise control over machining processes.

In contrast, other options do not accurately describe G-code. For instance, while network communication might use programming languages, G-code specifically targets machine control rather than data transmission. The third option about identifying materials does not represent G-code's functionality, as G-code focuses on movement and action commands rather than material classification. Finally, while operating manuals may contain operational guidelines for CNC machines, they do not encompass the specific programming language used to instruct the machine. Thus, defining G-code as the language used to control CNC machines captures its essence and function perfectly.