A preposition is a word or group of words used before a noun, pronoun, or noun phrase to show direction, time, place, location, spatial relationships, or to introduce an object.

Why do we need prepositions?

Why are prepositions important? ... Prepositions are used to connect nouns, pronouns, or phrases (called the object of the preposition) to other words within a sentence. They reveal the temporal, spatial, or logical relationship of their object to another word or part of the sentence.

Where do we use prepositions?

The Preposition 'To' for Movement

Use the preposition 'to' when indicating that there is movement from one place to another. In other words, the preposition 'to' with verbs such as drive, walk, go, hike, fly, sail, etc. We're flying to San Francisco on Thursday for a meeting.