{hyperref} is a package capable of producing hypertext links in documents. If your question is about cross-referencing in general, choose {cross-referencing}. If it's specifically about PDF features, consider to choose {pdf}.
hyperref is a package capable of producing hypertext links in documents. If your question is about cross-referencing in general, choose cross-referencing. If it's specifically about PDF features, consider choosing pdf.
In addition to the capability of producing hypertext links, hyperref can be used to add meta data to PDF files.
