What is the difference between static and instance classes in programming?

What is the difference between static and instance classes in programming?

Static classes are not instantiated and can only contain static members, while instance classes can be instantiated and have instance members.

Can you give me an example of when to use a static class?

Sure! Use a static class for utility functions that don't require object state, like mathematical calculations.

What about instance classes? When should I use them?

Instance classes are ideal when you need to maintain state or behavior specific to an object, like a user profile.

Are there any performance differences between the two?

Yes, static classes can be more efficient since they don't require object instantiation, but instance classes offer more flexibility.