The transaction is referred as a unit of work that is performed against a database. It is the propagation of one or more changes to the database. Properties of transactions are determined by ACID.
* Atomicity : It ensures that all work unit are successfully completed
* Consistency : It ensures that the database changes states upon a successfully committed transaction
* Isolation : It enables transactions to operate independently of and transparent to each other
* Durability : It ensures that the result or effect of a committed transaction persists in case of a system failure
