Definition clarity: In AutoCAD, a block is a named symbol or object collection that can be inserted repeatedly into a drawing, with a single editable definition controlling multiple instances. Decide whether this description is correct.

Introduction / Context:
Blocks are fundamental to CAD productivity. They encapsulate geometry (and optionally attributes and dynamic actions) into reusable symbols for doors, fixtures, valves, notes, and more. Understanding this definition helps drafters maintain consistency and reduce file size.

Given Data / Assumptions:

• A block has a name, base point, and internal objects.
• Multiple inserts reference one definition stored in the DWG.
• Edits to the definition update all instances.

Concept / Approach:
Using blocks minimizes duplication and supports standards. Attributes add data fields; dynamic parameters add stretch, flip, visibility states; WBLOCK writes blocks to external files for libraries. All of this is consistent with the idea that a block is a symbol you can insert many times while controlling it from one definition.

Step-by-Step Solution:
1) Create geometry and define a sensible base point.2) Use BMAKE/BEDIT to create or edit the block definition.3) Insert the block as many times as required.4) Edit the definition to propagate updates to all instances.

Verification / Alternative check:
Run BEDIT, change a line in the block, save; all instances update, confirming the definition-instance relationship.

Why Other Options Are Wrong:
“Incorrect”: Conflicts with AutoCAD's core block behavior.“Only temporary groups”: Groups differ; they do not create named, reusable definitions.“Cannot be reused”: The main point of blocks is reuse.

Common Pitfalls:
Using Groups instead of Blocks for standard symbols; inconsistent base points; exploding blocks unnecessarily and losing definition control.

Final Answer:
Correct