Plush (Saxony), Texture (Twist), Loop (Berber), Frieze (Shag), Cut/Loop (LCL), Woven, and Printed Patterns.
There are four yarn fibers used in the construction of carpet, Nylon, Polyester, Olefin and Wool
usage of area - light traffic (bedrooms, guest rooms), medium traffic (family rooms, playrooms, dens), heavy traffic (hallway, stairs).
The look - your style, color and overall look, what works well together what doesn't.
Your budget - how much you plan to spend.