Paths
Illustrator's basic building blocks are points and paths. Everything that we create in Illustrator starts from these and expands from there. Paths go by many names: paths, strokes, lines, line segments, or borders; yet they all refer to the same thing. These paths can be straight or curved and they can be open or closed (a shape).
Open Paths Versus Closed Paths
An open path is a line or line segment where both ends of the line are not touching. A closed path is what we know as a shape: a circle, square, rectangle, and polygon are all closed paths.
Outline Stroke/Expand
An open or closed path can be outlined or expanded to create a closed shape from a path. A stroke generally refers to a path that has a color and a weight applied to it; ...
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