Difference between javascript, jscript, jquery, ajax, json and xml

I spend the 4 hrs 30 minutes to clear my confusions. I have lot of doubts about Scripting and programming language. I often understand the difference between them using stackoverflow.com Q/A also using wikipedia for the clear cut. Acknowledging that

Whats the difference between DoubleClick Manager, DoubleClick Search, DoubleClick Bid Manager, DoubleClick AD Exchange, Google 360?

JK, What’s the difference between Doubleclick Campaign Manager (DCM), DoubleClick Bid Manager(DBM), DoubleClick Search(DS), DoubleClick Creative solution (DC)? It took almost few months for me to really understand this concept when I was working with agencies in the early part