Look at the desk or table where you are, right this minute. Someone designed that. It is art. Your shoes are art. Your coffee cup is art. All functional design, well done, is art. So, you could say "Art is something that is both functional and (hopefully) aesthetically pleasing to our eyes."

One of my photos was taken down due to "lack of artistic content". While this site is moderated by people who get to pick and choose "what is art", and I due respect their decisions, I wish only they had asked me to remove it (as I would have done from a request) instead of informing me after the fact. That is all.