Verbal sounds such as "uh," "er," "um," uh-huh" are often used when one is unsure and are called

These are called interferences or verbal fillers. This is often used, albeit by unexperienced speakers, by people when speaking in public to fill in a gap or a silence while synthesizing ideas or thoughts. This is more often than not used give the speaker a short pause without creating dead space.

Just dont put scarce