A trademark is a symbol, word, phrase, design, or combination of these elements that identifies and distinguishes the goods or services of one company from those of another. A trademark serves as an exclusive identifier of the source of the goods or services, and it helps to establish brand recognition and loyalty among consumers.

Trademarks can be registered with the government to protect the owner's exclusive rights to use the mark. Registration provides legal protection against the use of similar or identical marks by others in the same or related industries. Trademark registration is usually done at the national level, although some countries have regional or international systems for trademark registration.

To register a trademark, the owner must file an application with the relevant government agency in the India. The application must include a description of the mark, the goods or services associated with the mark, and evidence of the mark's use in commerce.

Once registered, a trademark owner has the exclusive right to use the mark in connection with the goods or services specified in the registration. The owner can also license the mark to others for use in exchange for a fee or royalty. 

Trademark infringement occurs when another company uses a mark that is confusingly similar to a registered trademark, and this can result in legal action by the trademark owner to protect their rights.