"Knock off" refers to a product that imitates the design or branding of a more expensive or well-known item, often without permission. These imitations are typically sold at a lower price and can be found in various markets, including fashion, electronics, and accessories. While they may look similar to the original, knock-offs often lack the same quality and durability. The term is commonly associated with counterfeit goods, which are illegal replicas of branded items. Consumers may be drawn to knock-offs due to their affordability, but purchasing them can support unethical practices and harm the original brand, such as Louis Vuitton or Nike.