C# - What is => operator?

I have a reference to a stack object as shown below. I am aware of the "=" assignment operator and it's function. But, can I know what is the difference between assignment operator and the "=>" operator being used here?

var stackObj= new Stack<Action>();
stackObj.Push(() => Obj.calculate();
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Carl TawnSystems and Integration DeveloperCommented:
The => operator is used for Lambda expressions. In your case it is a parameter-less Lambda expression that calls the calculate() method of Obj.
Carl TawnSystems and Integration DeveloperCommented:
Amandeep Singh BhullarCommented:
This is a Lambda Symbol in .net.
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sukhoi35Author Commented:
Thank you!
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