The /m/ sound is a “bilabial nasal,” which means you use both lips and breathe out through your nose to produce the sound. The sound of the letter ‘m’, which is /mm/ is made when lips are pressed together, causing the air to be blocked from escaping the mouth. The soft palate drops, allowing the air to pass through the nose.

m is a nasal-voiced sound which means the vocal cords get vibrated when we pronounce it. we make the /m/ sound by pressing the lips together stopping the air from coming out of the mouth and air is allowed to pass through the nose instead.