Before starting Angularjs we should know:

1) HTML & CSS
2) Javascript

Then second question comes in my mind is "Why we use Angular"

For this I have collect few point that are:

1) When we want to make dynamic site using javascript then Angular is a great choice.

2) Angular helps you organize your javascript.

3) By using angular we can easily create responsive (as in fast) website.

4) Angular is easy to test.

Difference between simple website and Angular js site

In simple website when any user click on the url then:

*) Web browser request to the server for this url and in response web server response with web pages and assets. By this way
browser load the entire page which take little time.
 
Where as in case of Angularjs website

*)  In angular js website when any user click on the url then web browser request to the server for this url and in response web server response with json data and data is loaded into existing data. By this way it will take very less time as compare to simple website.

So, I hope by this blog you have understood what knowledge we have before start Angular js , why we use Angular js and what are the difference between a simple web site and angular js website.

In next blog we will discuss What is Angularjs and how we will use with our framework.