Jigs are a staple in bass fishing. They are usually large hooks with colored strings,called skirts, usually made out of rubber.
Trailers, made out of soft plastics, are attatched onto the back of jigs to make them more attractive to fish. For more on soft plastics, look here
Here's an image of a chartreuse crankbait. Notice the bill that makes it diver unerwater
Good times to use Crankbaits