What are the kinds of envelopes?

Envelopes come in various types, including standard envelopes (like #10 for business use), padded envelopes for shipping fragile items, and window envelopes that display the recipient's address through a cut-out. Specialty envelopes include invitation envelopes, clasp envelopes for secure sealing, and resealable options for convenience. Additionally, there are decorative envelopes for personal correspondence and mailing, as well as eco-friendly options made from sustainable materials. Each type serves a specific purpose based on the sender's needs.