What is the purpose of 'volatile' keyword in C#

Question

What is the purpose of volatile keyword in C#?

Where would I need to use this keyword?

I saw the following statement, but I am unable to underst

Answer 1

It indicates that the value may get changed by a different thread, so the value needs to be read even if a previous instruction has already read it.

http://msdn.microsoft.com/en-us/library/x13ttww7%28VS.71%29.aspx