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Visible lines are the edges or "outlines" of an object. They are drawn as solid lines with a thick/heavy weight.

Hidden lines are dashed and thin, and they show the edges that are not visible from the view, but are still part of the object. For example, if you look at a cube from the front, you will see four visible lines and four hidden lines.

Object line: This solid line shows the outer edges of an object that can be visible in the finished building, such as walls and corners. They're the thickest lines on a blueprint. Hidden line: This line, also known as a hidden object line, shows surfaces that aren't visible in the finished building.

A visible line, or object line is a thick continuous line, used to outline the visible edges or contours of an object. A hidden line, also known as a hidden object line is a medium weight line, made of short dashes about 1/8” long with 1/16”gaps, to show edges, surfaces and corners which cannot be seen.

Hidden and visible lines are two types of lines that are used to represent the edges of an object in a technical drawing. Visible lines are solid and continuous, and they show the edges that are directly visible from the chosen viewpoint.

A visible line, for example, is used to show the edges (or “outline”) of an object and to make it stand out for easy reading. This line is made thick and dark. On the other hand, a center line, which locates the precise center of a hole or shaft, is drawn thin and made with long and short dashes.

Visible lines are continuous and thick, and they show the edges that are directly visible from the chosen view. Hidden lines are dashed and thin, and they show the edges that are not visible from the view, but are still part of the object.

Visible (Object) Lines: are used to indicate all visible edges that are seen when looking at an object. The symbol is a solid line. Hidden Lines: show surfaces that are not seen when you look at an object. They are indicated with a thin dashed line.