Postal boxes, also known as mailboxes, are secure containers used for collecting outgoing mail. They are typically found in public places, such as streets or post offices, and are designed to protect letters and packages until they are collected by postal workers. Postal boxes come in various sizes and colors, often marked with the logo of the local postal service, like the United States Postal Service. Users can drop off their mail in these boxes, which are emptied regularly by postal employees. The design of postal boxes ensures that mail is safe from weather and theft, making them a reliable option for sending correspondence.