This question already has an answer here:
Now I could go individually and select four vertices (two from the inner and two from the outer circle) and connect them as you normally would but that seems like a pain in the ass. I'm pretty sure there's a more efficient way of doing this, can someone tell me what's the right way of connecting the inner circle to the outer circle, in order to close the mesh? Also, why is it doing this? Shouldn't it recognize immediately that I'm trying to connect the selected circles?
Thanks in advance.