TJ Maxx and Marshalls also accept rejects or "seconds" that the manufacturer considers unsuitable for sales in their own stores. Always check the seams and buttons when buying clothing there to make sure it is not defective in someway that's unacceptable to you.
TK Maxx is all previous seasonal clothing. Most brands will bring out their new season of clothing every year and try to get rid of their old seasons for cheap, this is where TK Maxx comes in.