You have to show you are using it in commerce and there is a period of time where you can dispute a trademark once its filed. The trademark officer also manuall

You have to show you are using it in commerce and there is a period of time where you can dispute a trademark once its filed. The trademark officer also manually reviews the trademark to verify its not too common (think common words like paper or keyboard) and what is currently in use. *Not a lawyer, only filled a trademark application myself.