The word "crack" in warez context means the action of removing the copy protection from commercial software. A crack is a program, set of instructions or patch used to remove copy protection from a piece of software or to unlock features from a demo or time-limited trial. Sometimes a person will write a crack to show that they are smarter than the copy protection scheme. There are also crack groups who work together in order to crack the software. When you search for a full version warez download, you will often see the word crack amongst the results, which implies it is the full unrestricted version of the product.