A block is one or more objects combined to create a single object. Blocks help you reuse objects in the same drawing or in other drawings.
A block can be composed of objects drawn on several layers with various properties. You can use several methods to create blocks.
When you insert a block, you create a block reference and specify its location, scale, and rotation.
A dynamic block reference can be changed in a drawing while you work.
To reduce the size of a drawing, you can remove unused block definitions. You can remove a block reference from your drawing by erasing it; however, the block definition remains in the drawing's block definition table.
