A more thorough explanation:

Definition: Necessary and proper, adjective. Being appropriate and well adapted to fulfilling an objective.

Examples:

• A hammer is necessary and proper for building a house.
• A calculator is necessary and proper for solving complex math problems.
• A passport is necessary and proper for traveling to another country.

The examples illustrate that something is necessary and proper when it is essential or required to achieve a specific goal or objective. In each example, the tool or document mentioned is well-suited for the task at hand and is considered necessary and proper to complete it successfully.