英语词汇：Junk mail垃圾邮件

Junk mail is a term used to describe letters or advertising products which are sent to people who have not asked to receive them. It can also apply to email.

Examples:

Why does no one send me real letters anymore? All I ever receive is junk mail!

When I checked my email this morning there were 15 items of junk mail advertising all kinds of weird things.