The database choice depends on the data. Structured, related data (users, orders) fits a relational database like PostgreSQL. Flexible or fast-changing data can suit a document database. Either way, the data is stored centrally so it's consistent across devices and sessions.
How data is stored and protected is a core responsibility, especially for personal or payment information. That means encryption, access controls, backups, and following privacy rules like GDPR. Storing sensitive data carelessly is one of the most common and costly mistakes.
Updated July 2026
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