Joomla is what is known as a CMS, or Content Management System. It is used to design websites and has many modules or extensions that can be added to increase the ability of your website. These may be things such as e-commerce applications for creating an online store, an image gallery tool, etc.
Here are a couple of links to help you:
Joomla getting started guide
If you decide to install Joomla to your account, here is a link to help you with that as well.
Installing Programs with Softaculous
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