1. Static Variable:

   • What it is: A variable that belongs to the class, not to objects.
   • Example: If you create multiple objects of a class, all of them will share the same static variable.
   • Key Points:
     • It's shared among all instances of the class.
     • Keeps its value between method calls.
   • Example:

     class MyClass {
         static int count;
     };

   • This count variable having the single shared memory
   • It can be overridden
   • It can access by using class name

2. Static Method:

   • What it is: A method that belongs to the class, not an object, and can be called without creating an instance.

   • Key Points:

     • Can only access static variables or other static methods.
     • Cannot access instance variables directly.

   • Example:

     class MyClass {
         static void printMessage() {
             cout << "Hello!";
         }
     };

     • Make the object of the class and pass the instance variable for access the instance variable inside the static method.

3. Static Class:

   • What it is: A class that cannot be instantiated and only contains static members (variables and methods).
   • Key Points:
     • Only static members allowed.
     • Cannot create objects of this class.
   • Example:

     static class MyUtility {
         static void DoSomething() {
             Console.WriteLine("Doing something!");
         }
     }
     MyUtility.DoSomething();  // Can only call methods like this.

In summary, static means something is shared or belongs to the class, not individual objects.