A: Atomicity (Atomicity)
Atomicity means that a transaction is an indivisible unit of work, either all operations in a transaction happen or none happen. It can be understood as for the process.
C: Consistency (Consistency)
Consistency means integrity before and after the transaction must be consistent. It can be understood as the results for.
I: Isolation (Isolation)
Isolation means that when a plurality of users concurrent access to the database, a user database for each open transaction can not be interfered with the operation of other things, to isolation between a plurality of concurrent transactions. That is not visible to other transactions until the transaction commits.
D: Persistent (Durability)
Persistence means that once a transaction is committed, he changed data in the database is permanent, then even if the database fails nor should it have any impact.