What does G-code represent in CNC machining?

G-code is a programming language that specifically instructs CNC (Computer Numerical Control) machines on how to perform tasks. It comprises a series of commands and codes that dictate movements, speed, and other operational parameters for machining equipment. In essence, G-code tells the machine where to move, how fast to move, and what path to follow, allowing for precision and automation in the manufacturing process.

The other options do not accurately describe G-code. For instance, G-code is not a measurement standard; it does not define units or provide specifications for physical dimensions. It also does not qualify as safety equipment, as it pertains to programming rather than protection. Furthermore, while manuals may provide important operational guidelines, they do not constitute G-code itself, which is meant for machine control rather than serving as a reference document for operators.