Plone is a content management system (CMS)/web content management (WCM) system. It has been developed since 2001 and there are hundreds of solution providers and (Plone) core developers. There are roughly 1800 software projects (add-ons) related to Plone registered on Plone.org
Plone is suitable for most things web-related, although the database used is optimized for reads, one can with the right tools create almost any web application imaginable. Websites, web applications, web apps (think iPhone/Android "shell" and web page content) and so on.
Plone was and still is an add-on to the Zope system which we know well, so if there are special cases for extreme scalability regarding input for example, we can create a custom database layout or use MySQL/PostgreSQL to ramp up the ability to handle massive inputs.
Out of the box Plone delivers a modern CMS with many features, suitable for everything from small personal or group websites up to company websites. And with the right tweaking it can support thousands, tens of thousands or more of simultaneous users.
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