Differences Between Structures and Classes:-

1. Structures are value types ,use stack memory and the classes are reference types, use heap memory.
2. Classes are usually used for large amounts of data, whereas structs are usually used for smaller amounts of data.
3. Classes can be inherited whereas structures not.
4. A structure couldn't be null like a class.
5. A structure couldn't have a destructor such as a class.
6. A structure can't be abstract, a class can.
7. A class has all members private by default. A struct is a class where members are public by default.
8. Class can have constructor and destructor of all types and Structure can only have the parametrized constructor. it means a structure can not have the non-parametrized constructor,default constructor and destructor also.
9. The member variable can be initialized directly in class and The member variable cannot be initialized directly in structure.
10. Class object cannot be created without using the new keyword, it means we have to use it. Eg: Demo obj=new Demo() and Structure object can be created without using the new keyword.(optional). Eg: Demo obj;