You can use linetypes to distinguish objects from one another visually and make your drawing easier to read.
At the start of a project, you load the linetypes that are required for the project so that they are available when you need them.
All objects are created using the current linetype, which is displayed in the Linetype control on the Properties toolbar.
You can change the linetype of an object by reassigning it to another layer, by changing the linetype of the layer the object is on, or by specifying a linetype for the object explicitly.
You can use the same linetype at different scales by changing the linetype scale factor either globally or individually for each object.
You can center the pattern of a linetype on each segment of a polyline, and you can control how the linetype is displayed on short segments.