To resend means to send something again, usually because the first attempt didn't work or the recipient didn't receive it. If you email your teacher a homework assignment but it bounces back with an error message, you'll need to resend it. If your friend says they never got the birthday party invitation you mailed, you might resend it to make sure it arrives this time.

You can resend emails, text messages, letters, packages, or any other kind of communication. Sometimes you resend something because it got lost in transit. Other times you resend it because the person accidentally deleted it or needs another copy.

In the digital world, resending happens all the time. An online store might resend your receipt if you can't find the first one. A doctor's office might resend appointment reminders. The key idea is that you're sending the same thing over again, not sending something new or different.