What is the difference between object and class in Scala?

In Scala, both object and class are used to define classes, but they have some important differences.

1. The class is used to create instances of a class, while object is used to create singleton objects. In other words, a class can have multiple instances, while an object can only have one instance. Object can be seen as a companion object of a class, where the static methods and properties of the class are defined.
2. While classes can be inherited, objects cannot. With objects only capable of having one instance, they do not have the concept of inheritance.
3. Classes can have constructors, while objects cannot have constructors. The constructor of a class is used to create instances of the class, it can have parameters and be overloaded, while objects do not have constructors, their instances are created when they are defined.
4. Classes can be instantiated, while objects cannot. Since objects can only have one instance, they cannot be instantiated using the new keyword.

In summary, the class is used to create classes that can have multiple instances, while the object is used to create a singleton with only one instance.