Ooh is a sound people make when something surprises, delights, or impresses them. When you open a birthday present and love what's inside, you might say “Ooh!” When fireworks burst across the night sky, the crowd responds with a collective “Ooh!” followed by “Ahh!”

The sound captures that instant when something catches your attention in a good way. Scientists call these exclamations or interjections: words that express feelings rather than ideas. When your friend shows you their impressive LEGO creation, your “Ooh!” tells them you're genuinely impressed without needing a full sentence.

You'll also see ooh in writing to show a character's reaction. In a story, when someone discovers hidden treasure, the author might write: She opened the chest and gasped, “Ooh!” The word works because readers know exactly what feeling it represents: that spark of wonder or excitement that makes you catch your breath.