Now before you downvote me, I just want to say that this is a legit question I have right now and considering that in recent debates sparking around on the Internet, I want to know whether there is some truth behind this.

I couldn't find anything though, except that somebody referred me to modular arithmetic. But I don't quite understand what he meant by that. So, does modular arithmetic actually allow an operation like $2+2=5$? If that's the case, wouldn't that mean that $2$ is a completely different concept in modular arithmetic?

I also tried searching the question here, and no find. So, I am sorry if this question has been already discussed here already.