Mashable:

Stuttering — a speech characteristic marked by repetitions in sound, prolonged pauses and repeated words. Though stuttering impacts an estimated 70 million people globally, it’s widely misunderstood, leading to widespread stigma.

Often, the person who stutters is seen as lacking intelligence or authority in what they have to say. But, in reality, stuttering is just a variation of “expected” speech.

For many people, stuttering is a lifelong condition, even with treatment like speech therapy.

As a stutterer myself, there is some great advice in this piece if you know anyone who has a stutter. Patience is the key.