What are the keys called that have multiple-purpose functions?

The correct choice is soft keys because these keys are designed to change their function based on the context of the application being used. Unlike hard keys, which have fixed functions, soft keys can be programmed to execute different commands or tasks depending on the interface displayed. They allow for greater flexibility and efficiency in operations, as they adapt to the user's needs at any given moment.

For example, in a robotic control system, soft keys may allow operators to switch between different control modes or access various functions that are relevant to the task they are currently performing. This versatility is crucial in a robotic environment where operations may vary widely depending on the circumstances.

Hard keys, on the other hand, have a specific and unchanging function assigned to them. Function keys are typically designated for specific operations but do not exhibit the same level of adaptability as soft keys. Macros refer to a series of commands that are executed as a single command but are distinct from the concept of soft keys, which focus on variable functions at a single point in time.