How can it be that the Universe is infinite?

How can it be that the Universe is infinite?

The universe may be infinite, but we can only see a finite part of it because of the speed -also finite- of light.

In other words, we can only see those parts whose light has had time to reach us since the beginning of the universe. That is, in theory we can only see a spherical universe with a radius of approximately 15,000 million light years.

What is further away has not yet reached us.