When should you use the singleton pattern instead of a static class? [closed]

Question

Singletons can implement interfaces and inherit from other classes.
Singletons can be lazy loaded. Only when it is actually needed. That’s very handy if the initialisation includes expensive resource loading or database connections.
Singletons offer an actual object.
Singletons can be extended into a factory. The object management behind the scenes is abstract so it’s better maintainable and results in better code.