What exactly are loop carpets and plush carpets?

Loop carpet is where the carpet pile forms a loop. The pile comes from the backing to its full height, forms a loop and returns to the backing. Loop carpets provide a fashionable look to any room and don’t tend to show footprints. They are also durable and easier to maintain.
Plush carpets are achieved where the loops are first cut and the tips of the loops sheared. Plush carpets have a luxurious feel underfoot and can be used in formal areas. Their high-density pile will ensure many years of comfort.

Source: www.choicesflooring.com