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A language for querying and changing relational databases.
SQL lets you ask questions like “find this user,” “count today’s signups,” or “insert this payment record.” It is expressive because the database can filter, join, sort, and aggregate data close to where it lives. Bad SQL can be slow or unsafe, so parameters and indexes matter.
Plainly
Think of SQL as a labeled box where an app keeps important things. A language for querying and changing relational databases.
In practice
Use it when a feature reads, writes, migrates, validates, or audits stored information. In practice, define the owner, input, output, and failure mode before you rely on it.