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What is a "transaction"? Why are they necessary?

 A transaction is a series of data manipulation operations mostly triggered from the client end that
must be committed into the database as one whole operation. This means that a transaction is
complete only when all the series of data manipulations involved have been successfully committed
into the database. All transactions must follow the ACID rules.
• Atomic - All operations execute or No operations execute.
• Consistent - After the operations execute, database is in a consistent state as it was
before execution.
•
Isolated - Appropriate locks are placed on shared data in order to isolate the operation
on the data.
•
Durability - Data must be persisted on hard disk, so that if there is a crash the data is
durable.
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