Most people are familiar with printing an organizational chart on paper, but distributing them online can be much more useful. Both let you see the structure of an organization and read the names and titles of the people that work in it, but only an online chart lets you interact with it.
If you want to know who the VP of Sales' assistant is, you can find out from the org chart. With a printed chart if you want to contact her, you can find her name, but then have to look up her email address. With an online chart, her name can be linked directly to her email address, so that clicking on it in initiates an email to her automatically. Positions can also be hyperlinked to other documents, like job descriptions, or even records in the employee database. Your org chart can become a visual interface to more detailed information.