Web crawler

A Web crawler is a computer program that browses the world wide web in a methodical, automated manner. Other terms for Web crawlers are ants, automatic indexers, bots, and worms or Web spider or Web robot.

What is a Botnet?

A botnet or robot network is a group of computers running a computer application controlled and manipulated only by the owner or the software source. The botnet may refer to a legitimate network of several computers that share program processing amongst them.

Usually though, when people talk about botnets, they are talking about a group of computers infected with the malicious kind of robot software, the bots, which present a security threat to the computer owner. Once the robot software (also known as malicious software or malware) has been successfully installed in a computer, this computer becomes a zombie or a drone, unable to resist the commands of the bot commander.

A botnet may be small or large depending on the complexity and sophistication of the bots used. A large botnet may be composed of ten thousand individual zombies. A small botnet, on the other hand may be composed of only a thousand drones. Usually, the owners of the zombie computers do not know that their computers and their computers' resources are being remotely controlled and exploited by an individual or a group of malware runners through Internet Relay Chat (IRC)

There are various types of malicious bots that have already infected and are continuing to infect the internet. Some bots have their own spreaders - the script that lets them infect other computers (this is the reason why some people dub botnets as computer viruses) - while some smaller types of bots do not have such capabilities.

Joomla

What is Joomla?
Joomla is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.

What's a content management system (CMS)?
A content management system is software that keeps track of every piece of content on your Web site, much like your local public library keeps track of books and stores them. Content can be simple text, photos, music, video, documents, or just about anything you can think of. A major advantage of using a CMS is that it requires almost no technical skill or knowledge to manage. Since the CMS manages all your content, you don't have to.

What are some real world examples of what Joomla! can do?
Joomla is used all over the world to power Web sites of all shapes and sizes. For example:
Corporate Web sites or portals
Corporate intranets and extranets
Online magazines, newspapers, and publications
E-commerce and online reservations
Government applications
Small business Web sites
Non-profit and organizational Web sites
Community-based portals
School and church Web sites
Personal or family homepages