A "lemon" most often refers to a defective new or used car, but can also apply to any product that was defective at the time it was purchased.

State and federal lemon laws may protect consumers in United States when they buy a product with a reasonable expectation that the product worked properly.

Lemon laws often involve breach of warranty. A warranty, under the law, is an expectation that the product will work.

A warranty can be either express, meaning the seller said it was a warranty, or implied, such as the implied warranty of fitness. Find an attorney for a lemon law case in United States.