An aerogram is a special kind of letter that you can send in the mail. It's like a regular letter, but it's designed to be very lightweight, so it's easier to send by plane. You might use an aerogram if you're sending a letter to someone who lives far away, like in another country.
Aerograms are made out of thin, special paper that's designed to be folded up into a little envelope. When you fold it up, the paper becomes a little packet that you can write your message on. The packet is very light and thin, which makes it cheaper to send by mail.
When you're finished writing your message, you just fold up the aerogram carefully and put it in an envelope. Then, you can put the envelope in the mailbox or take it to the post office to be sent to your friend or family member far away. When your aerogram arrives, your friend can unfold it and read your message just like a regular letter.
Overall, an aerogram is a special kind of letter that you can use to send messages to faraway places. It's a lightweight, affordable way to stay in touch with people you care about, even when they're very far away!