Once you have a product or service and think you have a name for it, how do you know you can use it as your own? What happens if you unintentionally use a registered trademark name?
Too many people use a name without knowing whether or not they have the legal right to do so. They organize massive marketing campaigns with names they later find they’re not allowed to use. Performing a trademark search before deciding which trademark to register is a wise thing to do, especially when you consider future risks of litigation.
It is a good idea to carry out some research before starting to do business with a trademark. It may not be in your best interest to use a mark if another company is already actively conducting business in the same class. The other company may object to you using the trademark and legally prohibit you from doing so.