Q is like a username of a poster who posts on the 4chan, now 8chan message board. A message board works kinda like this one, you have all kinds of comments from all kinds of users, in all kinds of directions. Those message boards (which frankly, can be a SESSPOOL of garbage) are intended for privacy and your username is designed to be anonymous. This Q poster began signing their "anonymous" posts with Q.
Q's posts stood out and seemed important enough for people to begin "archiving" the posts signed by Q. They have gone through extensive lengths to keep the servers up.
Qmap.pub is simply a chronological order of all of the posts on that message board by Q. Some are oddly structured seeming gibberish, some are links to news and articles, some are messages.
Some people think it is President Trump. Trump's Twitter posts have lined up after Q posts repeatedly. Some think it's military coordinated, or secret service. I've heard they have a "security clearance. I really don't really know about all of that, but man... were they on top of "antifa" being designated a terrorist organization the night before it was brought up. They implied the military was already tracing Antifa networks the night before the President declared it.
White Supremacists... KKK... i'll tell you what it un-surprisingly really is. It's peaceful opposition to the far left elites that are ok with using people as pawns to enact the type of government reform they want. They're opposition to the folks who hijack BLACK LIVES MATTER in the shadows and on television where black community leaders on the ground cannot be heard anymore... just to steal their power and drum up soldiers for a war they have wanted to have in their minds for a long time.