Lazy loading in Entity Framework is the default phenomenon that happens for loading and accessing the related entities. However, eager loading is referred to the practice of
It is better to use eager loading when it is possible, because it optimizes the performance of your application.
ex-:
Eager loading
var customers= _context.customers.Include(c=> c.membershipType).Tolist();
lazy loading
In model customer has to define
Public virtual string membershipType {get; set;}
So when querying lazy loading is much slower loading all the reference objects, but eager loading query and select only the object which are relevant.