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The unique identifier for a row in a database table.
Primary keys let databases find, update, relate, and protect individual records. They are usually IDs and should not change casually.
Plainly
Think of Primary Key as a labeled box where an app keeps important things. The unique identifier for a row in a database table.
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.