Definition
An envelope is a flat paper container, typically rectangular, used to enclose a letter or document. Think of it as a protective shell for your important messages. It keeps the contents private and safe from damage during mailing. Envelopes come in various sizes and colors, often with an adhesive flap for sealing. Itβs like a cozy sleeping bag, but for paper! βοΈ They can also be plain or decorated, adding a touch of personality to your mail.