"Uh" is a common vocal filler used in spoken language. It often indicates hesitation, uncertainty, or a pause in thought. People use it when they need a moment to gather their thoughts or when they are unsure of what to say next. In conversation, fillers like "uh" can help maintain the flow of dialogue, signaling to listeners that the speaker is still engaged. While often seen as informal, these sounds are a natural part of speech and can be found in many languages, serving similar functions in communication.