A "product flop" refers to a product that fails to meet sales expectations or gain market acceptance. This can happen for various reasons, such as poor marketing, lack of consumer interest, or competition from better alternatives. When a product flops, it often results in financial losses for the company that developed it. Examples of product flops include the Apple Newton, a personal digital assistant that struggled with functionality, and Google Glass, which faced privacy concerns and limited consumer appeal. These failures highlight the importance of market research and understanding consumer needs before launching a new product.