What is Joomla?
Joomla is a free and open-source content management system (CMS) for publishing web content. It is built on a model–view–controller web application framework that can be used independently of the CMS.
WHAT IS JOOMLA AND HOW DOES IT WORK
Joomla is an Open Source Content Management System (CMS).
Let's break that down into two things :
1)A Content Management System is a piece of software that runs on a server and delivers a website to your browser (Internet Explorer, Chrome, etc) when you request it.
It allows the page you see to be dynamic (it can change depending on what you're doing) and it allows the owner of the site to make changes to the way the site looks without changing the 'code' behind the site.
2)Open source is a concept that basically involves allowing a community to develop and improve a piece of software. None of the people involved in the Joomla project (and there are tens of thousands) are paid, they're all volunteers. The Joomla community do what they do to make the web a better place.
There are two key parts to a Joomla website, one controls how the site will look and the other the information that you see, the content. How a website looks is controlled by something called HTML, this is the language that your browser 'reads' - from this, your browser knows what colour to make the text, where to put a certain image, how far away one thing should be from another and a whole host of other things.
The content part of the site (the text) is delivered 'dynamically' from a database, which is seperate from the HTML part of the site.
The database just stores plain, unformatted text, but allows the web page to connect to it, so when you look at a Joomla website page in a browser, the two are brought together and displayed -
The HTML controlling how everything looks and the database providing the content. When you click a link to a new page, the HTML mostly stays the same, but the browser requests new content from the database, depending on which link you clicked.
Advantages
1)Free and Open Source
2)Full fledged CMS
3)More powerful and robust then wordpress
4)SEO friendly with SEF plug-in
Disadvantages
1)Not SEO friendly out of the box
2)Javascript and CSS can get bulky
3)Some plugins cost money while many are free with wordpress
4)May need a developer for some of the changes.
Video Tutoril about Joomal
https://www.youtube.com/watch?v=Qjnc0H8utks