What does a dashed line represent in technical drawings?

In technical drawings, a dashed line is used to represent hidden details that are not visible from the outside of an object. This allows the designer or craftsman to convey important information about features that exist within or behind the surface of the object but are not observable in a standard view. For example, in a woodworking project, elements like internal supports, cavity sections, or features behind a façade will be illustrated using dashed lines to indicate their presence without relying solely on perspective.

The use of dashed lines helps in maintaining clarity and ensures that all relevant information is communicated effectively, allowing for accurate construction or modification of the design without the need for destructive methods to reveal hidden details. In contrast, visible edges are typically shown with solid lines, dimensions are indicated with dimension lines, and construction notes are usually provided with different styles or annotations rather than dashed lines.