Trademark gives complete ownership on the registered trademark, In case someone try to copy your even though with minor changes without your permission the registered owner of registered trademark can legal action.
Trademark registration gives your product and services unique identification and makes its easy for your customers to find your product.
Trademark is also an valuable to your assets to your business which means trademark can also be sell, purchase and even though can be lease out (licenses) like your tangible properties.
Trust and Goodwill :
As registered trademark begins the uniqueness to your product. It can easily create a sense of trust, goodwill and quality in the mind of your customers.