While Mount Everest is located in the Himalayan mountain range, which is itself a massive fold mountain system, it's important to note that Mount Everest is not a fold mountain itself. It's a fault-block mountain formed by the collision of the Indian and Eurasian tectonic plates.
However, Everest's towering height makes it the ultimate peak within the Himalayan fold mountain range, which is considered the highest mountain range in the world.