...
A PDF file stores metadata about the document, including the title of the document. This is different than the filename. Having a clear and accurate title helps ensure that users are reading the correct document. It also helps with findability. If the title is missing from the metadata fields, the PDF will fail this test. See: Changing the title of an Adobe PDF | Swarthmore ITS Solutions.
Tagged
Creating structure in a PDF file allows screen readers to easily navigate a document.
...