What is the purpose of leader lines and arrows in technical drawings?

Leader lines and arrows in technical drawings are primarily used to indicate the exact part being referenced. They provide a clear connection between the annotation or note and the specific feature or detail on the drawing. This is critical for ensuring that anyone interpreting the drawing can easily understand which component is being described, facilitating communication and reducing the possibility of errors during construction or manufacturing processes.

Leader lines direct the viewer's attention to a particular area when additional information is provided, such as dimensions, materials, or specifications. The arrows often point directly at a feature to signify that it is the subject of the accompanying text. This clarity is vital in technical communications, where precision is essential for accurate implementation of design intent.

While other options may seem relevant, they pertain to different functions in technical drawing. For instance, indicating the boundary of a section or noting the scale of a drawing involves different conventions and symbols that do not include leader lines or arrows. Highlighting important features might be done through various means, but it isn't the primary function of leader lines and arrows, which are more directive in nature.