if we want to access and manipulate objects without considering much about its data resources, we use ORM. ORM allows programmers to maintain a consistent view of objects over time.
Mapping details between a set of objects is managed by ORM. ORM converts data between relational databases and Object oriented Languages.

Consider the following Java Class example:

public class Employee {
   private int id;
   private String fn; 
   private String ln;   
   private int salary;  

   public Employee() {}
   public Employee(String fname, String lname, int salary) {
      this.fn = fname;
      this.ln = lname;
      this.salary = salary;
   }
   public int getId() {
      return id;
   }
   public String getFirstName() {
      return fn;
   }
   public String getLastName() {
      return ln;
   }
   public int getSalary() {
      return salary;
   }
}