Using WordPress Plugins
WordPress plugins allow bloggers to easily add additional functionality to their blogs. There are a huge number of plugins available that extend the functionality of WordPress.
What can you do with a WordPress plugin? Just about anything. There are plugins to block spam, help you publish a podcast, and to improve the performance of your WordPress blog. If you have some specific need that is not yet accommodated by the core WordPress code-base, chances are there’s a plugin to meet your needs.
This video is an introduction to working with WordPress plugins.