What is Rms?

Hello,

I was hoping someone could explain what RMS means in simple terms.

I have a driver with the following Specs:
Output: 5A Rms Max.
Motor : 5A Peak Full-Step
Phase: 7.1A Peak Microstepping.

I have a motor with a documented Phase Current of 6A.

Does it mean that I'll be able to run it OK Microstepping given its
within the 7.1A peak however won't be able to run it at Full-Step?

Gecko drives and other bipolar drives on the market appear to just
quote the microstepping peak phase rather than mentioning Rms.

Thanks in advance.

Robert