What Causes a Language to Become Extinct?

A language becomes extinct when no one speaks it anymore. Imagine a group of people who all speak the same language, like a family speaking Spanish at home. If that family moves away and starts speaking English instead, their children might not learn Spanish anymore. One day, there might be no more Spanish speakers left in that family, and that language could disappear.

It's like when you have a favorite toy that only one person plays with, if that person grows up and stops playing with it, the toy becomes forgotten.