What is document control?
Document control is how a company makes sure people work from the right version of a controlled document. Every drawing, SOP and work instruction has an owner, a revision, an approval before release and a record of what changed. Superseded revisions are kept for history but taken out of use.
The real risk is the printout taped to the machine. A drawing gets revised, the new PDF lands in a shared folder, and line 2 keeps building to Rev B for three weeks. When the auditor asks who approved the change and who was told, you go looking through email.