"Umm" is a common vocal filler used in speech, often indicating hesitation or uncertainty. People use it when they need a moment to think or when they are unsure about what to say next. It can help maintain the flow of conversation while the speaker gathers their thoughts. In many cultures, using "umm" is considered a natural part of communication. It can vary in frequency and acceptance depending on the context and audience. While some may view it as a sign of indecisiveness, others see it as a normal aspect of everyday language, similar to other fillers like "uh" or "like."