Alt-Right is the short form of Alternative Right. The term was first [coined][1] by Richard Spencer in 2008. He founded the website, alternativeright.org in mid 2000s. Richard Spencer stated in a [speech][2]:

> Well. What is the Alt Right? Who are you? Pepe. Yeah, absolutely. I’m
> sure some of you have first heard about the Alt Right after the “hail
> heard round the world” that occurred at the NPI conference. That was a
> lot of fun.
> 
> I would say that that moment, which went viral, is an expression of a
> lot of different things. It is certainly the expression of the desire
> of a mainstream media to slander and just silence us with one thirty
> second footage. “Aww, these people are terrible.” But I think it also
> says something about the life of the Alt Right. We don’t allow other
> people to tell us what we can joke about. We don’t play by their
> rules. We have fun, we can be outlandish, and that is never going to
> stop.
> 
> So, the Alt Right can’t be defined by something from the past. We
> can’t be trapped in the past. But we also need to go forward
> guilt-free. We need to be high energy, we need to have fun, we need to
> be a little outlandish, we need to trigger the world. So all I would
> say is: keep it up. I love you all.
> 
> So what is the Alt Right? When I first started using that term, it was
> about mid-2008, and at that point, I think the Alt Right was fairly,
> you could say, negative in its meaning. We didn’t quite know exactly
> what it was. I knew that something was profoundly wrong with
> mainstream conservatism. That was evident enough with the George W.
> Bush administration, with the neoconservatives disastrous wars in Iraq
> and so on, and with the rest of the mainstream Right offering no
> answers, the religious Right, all that kind of stuff. I knew that we
> had to have a new starting point. I also knew that we needed to — this
> wasn’t a matter just of tweaking the Right, as it is — this was really
> the matter of a new beginning. Of a new starting point for
> conservatism in America.
> 
> You can actually look at the starting point of the conservative
> movement, and they talk about global capitalism, and free markets, and
> the Constitution, and vague Christian values of some sort. But they
> never ask that question of “Who are we?” They never ask that question
> of identity. They probably assumed it. They probably assumed a white
> America, a European America, but they never really asked about it and
> they were never really conscious of it.
> 
> And so the conservative movement became, in its way, a mirror
> reflection, a photographic negative, of the Soviet Union. It became an
> ideological nation, it became a nation based on abstract values, like
> “muh freedom,” “muh democracy,” “muh bombin’ muh commies and Muslims.”
> It was never a place; it was never a people; it was a kind of
> ideology. That’s what conservatism was. And so I don’t think George W.
> Bush was some kind of aberration, some kind of wrong turn to the
> conservative movement; I think sadly he was an expression of that
> general trajectory. Not towards identity, not towards nationalism, not
> towards a sense of “us” or who we are, but towards this abstract
> universalism that ends up in ridiculous two trillion dollar wars in
> the middle east, that no one understands and no one can even remember
> what started them.
> 
> So, in a way, George W. Bush was the founder of the Alt Right. He was
> at least the founder of the term, because I knew that we had to get
> away from that. We had to get away from him. So I started using the
> term “Alt Right” in about mid-2008, and at that point, as I said, I
> don’t think it had an essence quite then. It was just a sense of
> not-that; let’s get away from W, let’s get away from all that, let’s
> start anew. From there, the Alt Right evolved, it took on new
> meanings, and in a way it was outside of my control, absolutely — the
> Alt Right has never been the Richard Spencer agenda or anything like
> that — the Alt Right has been organic, that’s why it has succeeded,
> precisely because other people have picked it up and they have added
> meanings to it, and so on.
> 
> But it kind of evolved with me, in a way. After I dropped out of
> graduate school, I worked in what you could call the anti-war
> conservative movement. I wanted to oppose George W. Bush’s agenda but
> I wanted to do it from a Right-wing perspective. That is, I evolved
> too. And by around 2010, I would say, I had an idea of where that new
> starting place was going to be. And that new starting point **was going
> to be identity.** And that was going to be the question that we asked
> first.

When the mainstream right embraced the establishment, Richard founded the alt-right to counter the mainstream right. The mainstream right is less extreme than  alt-right. And those who picked up this Ideology are mainly anti-establishment and far-right nationalists.

And there is two groups among them. One of them thinks the jews are the biggest problem of America and they are behind the white genocide and most other problems of America. Read some posts from [dailystormer][3] or altright.com to understand their views. The other disagrees and are fiercely anti establishment (Infowars.com is one of their mouthpiece). Both groups are far right and want radical changes in the government (they got what they wanted, Hail Trump!).

But the alt-right excludes an important element of far right which is the religious right. Its members are generally less religious and more nationalistic.

In a sentence, **the Alt-Right is the far right without the religious right.**


Also, check out the [SPLC][1] profile of alt right. Relevant excerpt:

> The Alternative Right, commonly known as the Alt-Right, is a set of far-right ideologies, groups and individuals whose core belief is that “white identity” is under attack by multicultural forces using “political correctness” and “social justice” to undermine white people and “their” civilization. Characterized by heavy use of social media and online memes, Alt-Righters eschew “establishment” conservatism, skew young, and embrace white ethno-nationalism as a fundamental value.


  [1]: https://www.splcenter.org/fighting-hate/extremist-files/ideology/alternative-right
  [2]: http://www.radixjournal.com/blog/2016/12/9/spencer-speaks-the-transcript
  [3]: http://www.dailystormer.com/a-normies-guide-to-the-alt-right/