The word to is used as a preposition to show where someone is going.
Sam walked to the library.
We went to school.
The team drove to the ball diamond.
The preposition to can also show the transfer of an object from one place to another.
He gave the book to the librarian.
Bob brought his dog to the vet.
I gave the gift to my mom.
We also use the preposition to when a person lets someone else see or hear something.
Mom sang a song to the baby.
The president gave a speech to the crowd.
I showed the picture to my dad.
Use the preposition to in a variety of ways: to show where an object or person is going; to show the transfer of an object from one place to another; and to indicate the presentation of something seen or heard.