Complete Skateboard
A complete skateboard can be found anywhere boards are sold as well as at many toy and sporting goods stores. The contain everything needed and usually pre-installed so the board is pretty much ready to ride right out of the box. Simply check to make sure all the bolts are tight and hop on.
A complete skateboard includes everything needed to ride right then. The wheels are installed with the bearings onto the trucks which are bolted to the deck. The deck is typically covered with black grip tape although there are many colors of tape that can be used.
Unfortunately a complete skateboard is typically installed with low quality equipment. The board deck and design may look just like the ones the pros are using, and often they are, but the trucks, wheels, bearings and bolts are usually very low quality. This is why many people prefer to custom set their boards with their favorite parts.