For instance, when preparing appendices for a scientific paper or presenting partial reports, you don't need an entire book or a detailed report saved in PDF. Instead of sending or printing voluminous files where it's difficult to locate the needed sections, you can extract them and save them as a new PDF. This is also convenient when working with laws, codes, technical instructions, lengthy books, and more. In any case, you can always extract only what is necessary and most important.
Sending only the most crucial fragments, sections, and pages is a great way to assist those who will continue working with these materials. By doing so, you allow your partners to save time searching for the required sections.
Confidentiality is not only a matter of good manners but is often a mandatory requirement. Access to the full version of a PDF document can frequently be restricted by contractual obligations and other rules. By extracting only specific details, you can safely share information without violating these rules.