Can you change the definition of a block in AutoCAD?

You can modify the block in block editor. When you finished, all block instances will be updated. This is much more faster than copying objects. If they are not blocks, when you need to modify it, you need to change them all. When you use block, AutoCAD will use the definition to all instances.
For More Information Please Refer:
https://www.cad-notes.com/why-use-autocad-blocks/
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