Full form of ACID is Atomicity Consistency Isolation Durability . ACID is the concept that database professional follow while evaluating relational database and application architecture. For a reliable database all of the following attributes should be achieved.
1.Atomicity: is an all-or-none rule for database modification .
2.Consistency: It guarantees that transaction never leave your database in a half finished state .
3.Isolation: keep transaction separated from each other until they are finished .
4.Durability: It guarantee that the database will keep track of pending changes in such a way that server can recover from any type of abnormal transaction .