Speech hesitations are common occurrences in which a speaker pauses or stutters while speaking. The two most common types of speech hesitations are ERS and EHS, which stand for filled pauses and empty pauses, respectively. Filled pauses are when a speaker uses filler words such as 'um' or 'uh' to fill the gap in their speech, while empty pauses are when a speaker stops speaking without using any filler words. Both types of speech hesitations can be used to indicate uncertainty or to give the speaker more time to think of what to say next.