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Print styles are used to change the appearance of an entity when it prints, without actually changing the entity in the drawing.
If your drawing uses named print style tables, you can specify a print style for any entity. Named print style tables contain print styles that you set up. If your drawing uses color-dependent print style tables, the print style is BYCOLOR, which cannot be changed. These types of print style tables determine printing requirements by the color assigned to an entity or layer. For details about converting a drawing that uses color-dependent print style tables to use named print style tables, See Changing a drawing's print style table type.
When you create an entity in a drawing that uses named print style tables, the entity is created using the current print style. By default, the current print style is BYLAYER. When you assign BYLAYER, changing a layer's print style changes the print style of all the entities assigned that layer if they were created using the print style BYLAYER.
You can also select a specific print style as the current print style, which overrides the layer's print style setting. Entities are then created using that print style, and changing the layer print style has no effect on them.
As a third option, you can use the print style BYBLOCK, in which case new entities use the Normal print style until you group them into a block. The entities then inherit the block's print style setting when you insert the block into a drawing.