Customizing the Design

Template Driven Design 
WordPress uses templates to generate the pages dynamically. You can control the presentation of content by editing the templates using the Template Editor tool and the Template Tags Template and File Editor 
Every installation of WordPress comes with a file editor you can use to edit your templates and other WordPress related files, right in your browser without having to worry about downloading and uploading the files in order to edit them. Template Tags 
Template tags make it easier to design the content and information displayed on your weblog. You don’t need to be a PHP whiz to design your weblog. Themes 
You can skin your weblog using readily available themes, or styles. You can also create and share your own themes. Plugins 
Plugins extend the core functionality of your weblog. A large number of user-developed plugins are already available and can be used to do virtually anything you want to, with your blog.