An envelope is a flat, usually rectangular paper or cardboard enclosure used for enclosing and protecting documents, letters, or other flat items for mailing or storage purposes. It consists of several key components, each serving a specific purpose. Here is a description of the typical elements found on an envelope:

Size and Format: Envelopes come in various sizes and formats to accommodate different types of documents and mailing requirements. Common sizes include standard letter (8.5 x 11 inches), legal (8.5 x 14 inches), and business (4.125 x 9.5 inches). Envelopes can be either open-ended (with a flap on one of the longer sides) or open-sided (with a flap on one of the shorter sides)

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