A prison is a secure building where people are held as punishment for committing serious crimes. When someone breaks the law in a major way, like stealing, hurting others, or other serious offenses, a judge might sentence them to spend time locked in prison. Prisoners live in small rooms called cells, follow strict schedules, and lose their freedom to come and go as they please.

The idea behind prison is punishment and protection: keeping dangerous people away from the community while they serve their sentence. Many prisons also try to help prisoners learn skills or change their behavior so they can successfully rejoin society when their sentence ends.

Prisons are different from jails, which usually hold people for shorter periods or while they’re waiting for trial. Prison sentences typically last years or even decades for the most serious crimes.

People sometimes use prison metaphorically to describe feeling trapped, like saying “My shyness felt like a prison” or “He was imprisoned by his fear of failure.” This means feeling unable to escape from something that limits you.

The word imprison means to put someone in prison, while a prisoner is someone locked up there.