Now, it is not about applying different line types to objects without any criteria. In fact, as you can see from the names and descriptions of the linetypes in the Linetype Manager window, many of the linetypes have very clear specific purposes in different areas of technical drawing. For example, in a civil engineering drawing, the line type can be very useful to show gas installations. In mechanical drawing, hidden or center lines are constantly used, etc. The following examples show some types of lines and their use in technical drawing. In fact, the Autocad user must know what the different types are used for depending on the area for which they draw, since they make up an entire alphabet of lines.
