When we use an application – whether it's online banking or a shopping site – we expect the data to be correct and the system to work reliably. If you transfer money and a glitch happens, you wouldn’t want the bank to deduct money from your account without adding it to the recipient’s account. This is why database consistency and reliability matter so much. A reliable database ensures that even if something goes wrong (like a crash or network issue), your data isn’t lost or corrupted.