A transaction in DBMS (Database Management System) is a group of tasks that are treated as a single unit of work. A transaction is the minimum processing unit that cannot be divided further. Transactions are used to make changes in data in a database, such as inserting new data, updating existing data, or deleting data that is no longer required. Transactions are used to ensure data integrity and consistency in a database system.

A transaction in a database system must maintain ACID properties, which stands for Atomicity, Consistency, Isolation, and Durability. These properties ensure accuracy, completeness, and data integrity in a database system. The ACID properties are defined as follows:

• Atomicity: A transaction is an indivisible unit of work, which means that either all the operations in a transaction are executed or none of them are executed. If any operation in a transaction fails, the entire transaction is rolled back to its previous state.

• Consistency: The database must remain in a consistent state after any transaction. No transaction should have any adverse effect on the data residing in the database. If the database was in a consistent state before the execution of a transaction, it must remain consistent after the execution of the transaction as well.

• Isolation: In a database system where more than one transaction is being executed simultaneously and in parallel, the property of isolation states that all the transactions will be carried out and executed as if it is the only transaction in the system. No transaction will affect the existence of any other transaction.

• Durability: Once a transaction is committed, its effects are permanent and will survive subsequent system failures[[1]](https://www.tutorialspoint.com/dbms...