Junk is a common English word with multiple meanings:
1. Junk refers to old or discarded objects that are considered useless or of little value.
2. In computing, junk mail refers to unwanted emails (spam).
3. Junk food describes food that is unhealthy but is quick and easy to eat.
4. Historically, a junk was a type of ancient Chinese sailing vessel.
5. In slang, "junk" can refer to drugs or narcotics.