A tangent line is a straight line that touches a curve at only one point and has the same slope as the curve at that point.
Tangent cheat sheet for homework
The derivative represents the slope of the tangent line to a curve at any given point.
Normal Line: The normal line is perpendicular to the tangent line and passes through the same point on the curve.
A secant line intersects with two points on a curve, while passing through other points between them.