A "complaint" is a statement expressing dissatisfaction or concern about a situation, product, or service. It can be made verbally or in writing and is often directed towards a person, organization, or business. Complaints are important as they provide feedback that can help improve services or resolve issues. In many contexts, such as customer service or legal matters, complaints can lead to investigations or resolutions. For example, a customer might file a complaint with a company about a defective product, prompting the company to address the issue. This process can help ensure better experiences for future customers and maintain quality standards.