Paper envelopes are essential office supplies used for mailing documents, letters, and small items. Made from various types of paper, including kraft and recycled paper, these envelopes come in multiple sizes and styles, such as windowed, padded, and security envelopes. They provide a professional appearance for correspondence and can be customized with prints and logos for branding purposes. Paper envelopes are recyclable and biodegradable, making them an environmentally friendly choice for businesses and individuals. Their versatility and cost-effectiveness make them a staple in offices, schools, and homes.