The keyboard will connect to the computer, so can’t the mouse piggy back on that wire by plugging in through the keyboard?
Edit: Turns out I just never knew they exist all over the place. Thanks! Learning a lot of cool new keyboard features out there.
Sure, many keyboards have a usb port that you can use. People tend to prefer leaving those ports open for temporary devices though (like a thumb drive) and instead plug the keyboard+mouse into the harder to reach ports on the back of the computer as they likely won’t need to move those often.
I plug my wireless mouse’s dongle on my keyboard USB port. I figure it’s the USB port that sits the closest to the mouse so least chance of interference (not that it’s ever been a problem but hey).