What it means
Almost every application keeps its data in a database. Relational databases such as PostgreSQL and MySQL store data in tables with clear relationships, which suits most business records. Document databases such as MongoDB store flexible records. Vector databases store embeddings for search by meaning.
How a database is designed, which tables exist and how they relate, decides how easy it is to report, change and trust the data.
Why it matters for a business
Your data usually outlives the app built around it. A clear database design makes reporting, integrations and new features easier for years. A messy one makes every change slower and every report harder.
A business example
Things to watch
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Back up regularly and test restoring.
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Give each application user only the access it needs.
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Plan indexes for the queries you run most.