Arc Fault vs Ground Fault Circuit Breaker
I need to replace a 15 amp ground fault circuit breaker. Looking at Lowes today I noticed that the circuit breaker I had my "eye" on is in fact a "Arc Fault" circuit breaker. Looking further I see other GFI breakers, at a higher price.
Given Lowes main business in residential, I wonder why they carry Arc Fault and even wonder if the two types can be used interchangeably. I assume they are not interchangeable and worry that the fact that they look similar could easily cause a mistake in a DIY project.
If possible in a few words, what is an Arc Fault used for?