The word "to" is a preposition often used to indicate direction, place, or position. It can also show the relationship of a noun or pronoun to another word in a sentence, often linking verbs to their objects. It is commonly used to express intent or purpose, as well as connections between ideas.
The word "to" comes from Old English "tō," which has the same meaning. It traces back to Proto-Germanic *tau, which meant "to" or "toward."