instance vs static methods c#

What is the difference between instance method and static method?
Instance method can access static variables and static methods directly. Static methods, variables belongs to the whole class, not just an object instance. A static method, variable is associated with the class as a whole rather than with specific instances of a class. Each object will share a common copy of the static methods, variables.
Do we need a static method?
For static methods, we don't require them as static methods means all the objects will have the same copy so there is no need of an object. e.g: In instance method each object will have different behaviour so they have to call the method using the object instance. e.g:
Why is a static method called from a class name?
They are relative to the individual object, hence the keyword this. A static method belongs to the class itself. You can call it without instantiating any members of that class. That's why the method is called from the class name and not from a specific instance.
Do instance methods alter variables?
Instance methods don't necessarily alter variables. It's simply a function that gets "shipped out", so to speak, with each instance of that object you create. They are relative to the individual object, hence the keyword this. A static method belongs to the class itself. You can call it without instantiating any members of that class.

Overview

Before we get to Algorithm #3 (accelerate towards the mouse), we need to cover one more rather important aspect of working with vectors and the PVector object: the difference between using static functions and instance methods. Forgetting about vectors for a moment, take a look at the following code: Pretty simple, right? x has the value of 0, we add y to it, and now x is equal to 5. We could write the corresponding code pretty easily based on what we’ve learned about PVector. The vector v has the value of (0,0), we add u to it, and now v is equal to (4,5). Easy, right? Let’s take a look at another example of some simple math: x has the value of 0, we add y to it, and store the result in a new variable z. The value of x does not change in this example, and neither does y This may seem like a trivial point, and one that is quite intuitive when it comes to mathematical operations with numbers. However, it’s not so obvious with mathematical operations in PVector. Let’s try to write the code based on what we know so far. khanacademy.org

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