code of Isolated Storage Windows Phone app

Question

What is exactly mean by Isolated Storage?
As per google result SQLITE & Isolated Storage both did approx same work, then what is difference between SQLite & Isolated Storage?

 

We can save text, audio, video, pdf any file in Isolated storage, what exactly happen which means all these files saved in Isolated Storage?
What is Similarity between these implementations? Is there any similarity or different implementation techniques are there?

 

Can anyone explain me by C# code?