1- Created using object keyword.

2- Creation of instance is not possible in case of singleton objects.

3- Inheritance is allowed, i.e. it can extend class and traits.

4- To excess members of Singleton object, we will use the singleton object’s name dot members name.

5- The method in the singleton object is globally accessible.

6- You are not allowed to pass parameter in the primary constructor of singleton object.

7- In Scala, a main method is always present in singleton object.