An SQL database is a structured data store organized into tables of rows and columns. SQL lets applications query, filter, join, update, and export records efficiently. In cyber security, that structure matters because a single database can concentrate high-value data such as customer identities, reservations, logs, and account details.
Attackers commonly target SQL databases through SQL injection, stolen credentials, exposed management interfaces, or compromised applications. Once inside, they may read tables, dump large datasets, or modify records to hide activity. Defenders reduce risk with parameterized queries, least-privilege access, network segmentation, monitoring for unusual reads and exports, and encrypted backups. If table contents are leaked, the structured data is easy to reuse for phishing, fraud, and extortion.