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A command-line interface: software controlled by typed commands instead of buttons.
CLIs are common for developer tools because they are scriptable and explicit. Examples include npm, git, vercel, and test runners.
Plainly
Think of CLI as a tool from the builder toolbox. A command-line interface: software controlled by typed commands instead of buttons.
In practice
Use it when you are installing, editing, testing, reviewing, or shipping code. In practice, define the owner, input, output, and failure mode before you rely on it.