The Constitution
enumerated powers
The specific powers the Constitution lists for Congress, chiefly in Article I, Section 8. The federal government holds these listed powers, not a general power to legislate.
In full
The Constitution grants Congress particular, listed powers: taxing and spending, borrowing, regulating commerce, declaring war, and the rest of Article I, Section 8's inventory. Everything Congress does must trace to one of them (alone or via the Necessary and Proper Clause). Powers not delegated are, by the Tenth Amendment, reserved to the states or the people.
Also written as: implied powers
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.