Erm.... Crisps are called potato chips in the US. Chips are called chips in the UK, despite the McDonald's effect, and are also made from potatoes.
Cut into individual units about the size and thickness of an adult male's index finger, it is sprinkled with salt and malt vinegar, unless you live in some parts of Scotland, where they use brown sauce instead of aforementioned vinegar.
Skip over the Channel, and then you have something different altogether and usually called frite or frites, depending on how many you order.
These are usually a lot thinner, much like the McD twigs and dipped in mayonnaise. The French do not call them french fries.
Crisps, on the other hand, are cross cut slithers from a whole potato, deep fried or oily baked until they are brittle, then salted or flavoured before being bagged.
So, crisps are not chips unless you are in the US and surrounding areas. Chips are not fries unless you are in a country that calls them fries, and neither are they frites.
I hope this clears things up.