A trademark violation occurs when someone uses a trademarked name, logo, or symbol without permission, leading to confusion among consumers. Trademarks are legal protections for brands, helping them distinguish their products or services from others in the market. When a violation happens, it can harm the original brand's reputation and sales. To prove a trademark violation, the owner must show that their trademark is valid and that the unauthorized use is likely to cause confusion. This can involve similar products or services, such as Nike shoes being imitated by another company. Legal action may be taken to protect the trademark rights.