Two internet connection

Hi friends
I connected to the internet using both the Ethernet and wifi at the same time. Does windows download data using both connections or only one.

Normally only one network adapter will be used at a time. There are a few exceptions, but the simple answer is "only one".

I assume you mean in one system where the previous answer would be correct. If you have multiple systems on a network, downloading can be done both wired and wireless simultaneously and it would be the role of the router to prioritize.