Hey thanks 
Gosh, I don't know where to start!
Let's see, before the uprisings, you had a situation in much of the Arab countries in the Middle East and North Africa where you had autocratic regimes that had been in power for many, many years. They were all massively corrupt, did not tolerate very much dissent, and engaged in many kinds of human rights abuses. (This varied a lot among countries of course.)
Many of them were supported to various degrees by the US and Europe, mostly in the interest of stability. Better to have in power a dictator who will help you go after jihadists and sell you oil, than any of the groups who might replace him.
At the same time, the populations in these countries were increasingly frustrated. There are lots and lots of young people with no jobs, no hope, no options. The people in the region not only had to deal with repression, they had to deal with poverty and lack of opportunity.
This frustration is a big reason why Islamist groups like the Muslim Brotherhood received support from parts of the population. Many of these groups have strong social justice platforms.
The catalyst for the Arab uprisings happened in Tunisia it's the most amazing story really. A fruit vendor named Mohammed Bouazizi set himself on fire and died, in protest of the corruption and unfair treatment he was being subjected to by authorities. His act sparked demonstrations that led to the departure of the Tunisian president, and fed protests in Egypt the massive protest in Tahrir Square that led to the downfall of Mubarak there. And also, the unrest in Libya that eventually culminated in civil war and our intervention.
Unfortunately, the removal of autocrats doesn't solve the problem. In Egypt again now there are massive protests and unrest because of actions taken by the Muslim Brotherhood, which came to power in elections. Libya is still a mess. And of course, Syria is a nightmare.
So it's a very volatile time and we will have to see what happens.
The problems aren't just political though -- it's not just about who's in power. The problem is that the societies as a whole have been massively damaged by decades of corruption and repression. It's a whole system that needs to be reformed, it will take a long time, if ever.
I don't know if that answers anything, sorry if it's really general but it's so hard to be concise! (not that I'm being that concise, sorry...)