Post box

A post box is like a special mailbox where you can put letters and cards to send to other people. It's usually a big metal box with a slot in the front that you can slide your letters into. Then, a person who works for the post office comes by and takes all the letters out of the post box to bring them to a bigger post office. From there, the letters get sorted and sent to the right places so they can be delivered to the people you want to send them to. So, basically, a post box is like a very important helper in making sure your message gets to the right person!