What is ORM (Object Relational Mapping) and Examples of ORM Softwares?

What is ORM (Object Relational Mapping) and Examples of ORM Softwares?
In computer science, ORM is a programming technique for converting data between incompatible type systems in OOP's(object-oriented programming) languages.
ORM stands for Object-Relational Mapping (ORM) is a programming technique for converting data between relational databases and object oriented programming languages such as Java, C# etc.
ORM tools provide a host of services thereby allowing developers to focus on the business logic of the application rather than repetitive CRUD (Create Read Update Delete) logic

Example of ORM Softwares's:-

EJB Entity beans	From SUN
Hibernate	From SoftTree(RedHat)
JPA	From Apache foundation
JDO	From SUN
OJB	From Apache Foundation
Toplink	From Oracle Software

All the ORM software internally generates Under Lying DB software specific sql queries Dynamically when programmer performs his persistence operations on object's.