What is a transaction and what are ACID properties in Oracle?

Question

Below is the one of the interview question which was held by Oracle

If a transaction is very large, and the rollback segment is not able to hold the rollback information, then will the transaction span across different rollback segments or will it terminate?

Answer 1

In computer science, ACID (Atomicity, Consistency, Isolation, Durability) is a set of properties that guarantee that database transactions are processed reliably.

for more detials:
http://en.wikipedia.org/wiki/ACID