struct-

• struct is a value type
• It is faster than class
• It cannot declare default constructor or destructor however it can have parameterized constructor
• It cannot derive another struct.
• struct have all members public by default.

Class-

• Class is reference type.
• It is like blueprint of logical data.
• It is slower than struct. 
• It can declare default constructor.
• Class has all member private by default.