What is defined as the line that forms the shape of an object?

The term that refers to the line forming the shape of an object is the "Path." In graphic design and illustration, a Path is essentially a vector line, which can be straight, curved, or a combination of both, and it defines the outline of shapes and forms within a design. Paths are fundamental in vector graphics, allowing designers to create complex shapes by connecting two or more anchor points.

In contrast, an Anchor Point represents a specific point at the end of a line segment in a path, while Smooth Points are types of anchor points that create a smooth transition between curves, and Fill refers to the color or pattern that fills the area inside a closed shape. These concepts are interconnected, but the path itself is the core line that outlines the form of an object, making it crucial for building and manipulating shapes in design.