What is a transaction? What are ACID properties?

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Ans: A Database Transaction is a set of database operations that must be treated as whole,
means either all operations are executed or none of them.
An example can be bank transaction from one account to another account. Either both debit
and credit operations must be executed or none of them.
ACID (Atomicity, Consistency, Isolation, Durability) is a set of properties that guarantee
that database transactions are processed reliably.