What are the features corrected by AutoCAD?

What are the features corrected by AutoCAD?
AutoCAD detects the problem and correct it by removing the corruption with drawing part. With the available option of adding additional vertices, it also adds vertices to the poly-lines. The error can be corrected or neglected by finding our exact location of the poly-line that has zero-vertices. The object can be deleted or removed after there is no use of it in this system.