Document library, whether it is a document file created from Microsoft Office suite or a PDF document or an img file, is similar to the central Share Drive of the organization where members on the team site can bring documents to store. It has interesting features such as being able to see who has viewed the document, add the document, edit the document, delete the document, download the document, if the document has been changed. There is a working version control function. Data access rights function, divided into groups and individuals, etc.