Is this a drain hole for condensation or just a hole that needs to be plugged?

[Fab]

Thank you!

[Troll]

Condensate drain. Cars have them, too.

[Fab]

Today, after a short ride, I noticed some drops on the garage floor.
At first, I was afraid it might be an oil leak, but I found out it was just water.
The water was slowly dripping from a small hole in the back of the muffler, most likely condensation (it's pretty cold here at the moment).

Please take a look at the photo. Is this a drain hole for condensation or just a hole that needs to be plugged?

Thank you!