system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What exactly is a voice crack?
gpt
When you speak, air travels between two thin folds of flesh in your throat called the vocal folds. When brought together, the air passing between them causes them to vibrate against each other and thereby produce sound like a reed.

If something goes wrong, the folds don’t come together at the right time or you slacken a little bit involuntarily, they can flop around a little. That would be a voice crack.

They happen most often during puberty because at that age the larynx (voice box) grows rapidly. Speaking and singing are exercises in muscular coordination, and if your body is not subconsciously used to the size of the instrument it’s dealing with there will be more little flubs.