A complaint is an expression of dissatisfaction with a product, service, or company. A complaint can be made verbally or in writing, and it is important to document any complaints made so that they can be addressed properly.There are many different types of complaints that can be made, and it is important to be as specific as possible when making a complaint. For example, if you are unhappy with the quality of a product, you should describe the problem in detail. If you are unhappy with the level of service you received, you should describe the situation and what you believe could have been done better.It is also important to include your contact information when making a complaint so that the company can follow up with you. Many companies have complaint procedures in place, and you may need to follow these procedures in order to have your complaint addressed.If you are not satisfied with the response you receive from a company, you can contact your local consumer protection agency or the Better Business Bureau. You can also file a complaint with the Federal Trade Commission.