What is a Trademark?
Trademark sometimes also generalised as trade mark or trade-mark.
Comes under the branch of Intellectual Property, which is combination of Sign, design or expression or anything whatever will give an identification of products or services should be different from others.

Well, we should think once why we need trademarks, just to give an identification of our products or services, so sometimes also known as service marks.
Who can be a trademark owner?
Individual, or
A business organization, or
Legal entity