Post-boxes are physical containers that are installed on public streets or in front of buildings to enable people to post letters and other correspondence. There are several synonyms for post-boxes, including mailbox, letterbox, post office box, drop box, and collection box. Mailboxes are typically found in residential areas and can be mounted on walls or freestanding. Letterboxes are found in homes and usually have a slot for posting letters. Post office boxes are rented from a post office and are used to receive mail. Drop boxes are also used for mailing, and they are often found in public areas like schools or libraries. Finally, collection boxes are used for collecting outgoing mail and are typically found near post offices or other locations.