When a method is static, it can be invoked directly from the class level without creating an object. It is the reason for making a main() method static.

Points for static keyword

• A static method can be invoked directly from the class level
• A static method not requires any class object
• Any main() method is shared through entire class scope so it always appears with static keyword.

Points for static class

• Contains only static memebers.
• Cannot be instantiated.
• Is sealed.
• Cannot contain Instance Constructors.