DXF supports reusable drawing components called blocks. A block defines a group of entities that can be inserted multiple times in a drawing. This feature helps reduce duplication and simplifies complex drawings.

Example: Block definition

0
BLOCK
2
Door
0
LINE
10
0
20
0
11
100
21
0
0
ENDBLK

The block named Door contains a line that represents part of a reusable drawing component.