What does the "BLOCK" command do in AutoCAD?

The "BLOCK" command in AutoCAD is used to group multiple objects into a single object. This functionality is essential for managing complex drawings, as it allows you to create a block that represents a collection of objects that are often used together. By creating a block, you can easily insert this combination of elements into your drawing multiple times without needing to recreate each individual object. This not only saves time but also reduces the file size and enhances drawing efficiency.

Once a block is created, it can be scaled, rotated, and manipulated as a single unit, making it much easier to manage assemblies of related objects, such as symbols for doors, windows, or furniture. When you insert a block into a drawing, AutoCAD uses the definition of the block to place a copy in the specified location, ensuring consistency throughout the design.

The other options pertain to different functions within AutoCAD but do not accurately describe the purpose of the "BLOCK" command. While separating objects into layers, locking objects in place, and changing properties are useful operations, they are distinct from the primary purpose of creating a block, which is focused on grouping objects for efficiency and ease of use.