Abstract Class vs Interface in C#

Hello Sam, the basic difference between Abstract Class and Interface is-

1)- Abstract class dosen't  provide a fully abstraction. whereas Interface provide a fully abstraction.

2)- Abstract Class allows Variable declartion and method declartion both. whereas Interface only allows method declartion.

3)- Abstract Class can have access modifier, by default everything is private. But Interface doesnt use access modifier by default everthing is public

4)-Abstract class provide parameterless constructor. where as constructor not used in Interface.

5)-Abstract class not allow multiple inheritance . where as Multiple Inheritance is possible by Interface.