@Rickoshay75,
The universe is constantly expanding. So an 'end' or 'border' to the area the universe encompasses is like the question of 'is there a now?' Any end or border to the universe's area will be exceeded a fraction of a moment later.
While it very nearly melted my brain, there's a physics-heavy article about this question here.
http://curious.astro.cornell.edu/the-universe/cosmology-and-the-big-bang/104-the-universe/cosmology-and-the-big-bang/expansion-of-the-universe/623-what-is-the-universe-expanding-into-intermediate?highlight=WyJ1bml2ZXJzZSIsInVuaXZlcnNlJ3MiLCJleHBhbmRpbmciLCJpbnRvIiwiaW50byciLCJ1bml2ZXJzZSBleHBhbmRpbmciLCJ1bml2ZXJzZSBleHBhbmRpbmcgaW50byIsImV4cGFuZGluZyBpbnRvIl0=
"This is a very good question which is not at all easy to give a satisfactory answer to! The first time I tried to write an answer to this, we got so many follow-up questions from people who were still confused that I decided to try to answer it again, this time much more comprehensively. The long explanation is below. However, if you just want a short answer, I'll say this: if the universe is infinitely big, then the answer is simply that it isn't expanding into anything; instead, what is happening is that every region of the universe, every distance between every pair of galaxies, is being "stretched", but the overall size of the universe was infinitely big to begin with and continues to remain infinitely big as time goes on, so the universe's size doesn't change, and therefore it doesn't expand into anything. If, on the other hand, the universe has a finite size, then it may be legitimate to claim that there is something "outside of the universe" that the universe is expanding into. However, because we are, by definition, stuck within the space that makes up our universe and have no way to observe anything outside of it, this ceases to be a question that can be answered scientifically. So the answer in that case is that we really don't know what, if anything, the universe is expanding into."
Note, that's the 'easy' version. Not-easy version can melt your brain so caution.