+An **envelope** is a common packaging item, usually made of [Paper](/wiki/paper), designed to contain a flat object such as a letter or document. It provides privacy and protection, often sealed for [Delivery](/wiki/delivery) through [Post](/wiki/post) to its recipient.
+## See also
+- [Letter](/wiki/letter)
+- [Mail](/wiki/mail)
+- [Sealing](/wiki/sealing)
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