A trademark is a symbol, word or logo that identifies and distinguishes the source and quality of goods or services of one party from those of others. It can be a word, name, device, packaging label or combination of colors. Famous examples are Coca Cola and Pepsi. Any individual or company can apply for a trademark which is valid for 10 years and renewable. The key functions of a trademark are to identify the source and guarantee the quality of products. Common types include names, logos and images. In India, trademarks are registered by the Controller General of Patents, Designs and Trademarks under the Trademark Act of 1999. The registration process involves filing an application containing the logo, applicant details and