Why legal teams number this way
Bates numbering exists so that every page in a discovery or disclosure production carries a unique, unchanging identifier. When thousands of pages move between parties, a stamp like "SMITH-004182" lets a deposition, a privilege log and opposing counsel all point to the exact same page without confusion. Use it whenever you assemble documents for litigation, an audit, a regulatory filing or any matter where pages must be cited precisely. The continuous-across-files behavior is the heart of it: a production is treated as one long sequence even though it arrives as dozens of separate PDFs, so no two pages ever share a number.