Ultimate Guide to Prepositions: What Is a Preposition? (With 100+ Examples) Published on June 18, 2026 • Written by the Grammar Team Jump to Section: What is a Preposition? | Visual Breakdown | Types of Prepositions | The Master List of 100+ | Key Grammar Rules | Frequently Asked Questions What Is a Preposition? 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. Think of them as the glue that anchors nouns into the broader flow of a sentence, showing how different elements connect to one another. For example, in the sentence, "The cat slept under the blanket," the word under is a preposition ...