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A key-value value in a URL after ?, often used for filters, search, or locale.
Query parameters let one route represent many states, such as /lexique?lng=fr&q=json. They are visible, shareable, and should not contain secrets.
Plainly
Think of Query Parameter as a named building block in a big LEGO app. A key-value value in a URL after ?, often used for filters, search, or locale.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.