Wordpress is an online blogging tool that support people in creating blogs or websites.
Resources required: 
PC or laptop, an internet connection (broadband it would be the best choice), an email address
Free unless you want to use additional add-ons http://en.wordpress.com/products/.
Setup and configuration: 
To register a valid email address is required. You can then create a blog and comment on other blogs.
People can choose all the features of their blog: font, themes (over 180), plugins (more than 18.000), which allows users and developers to extend blog abilities beyond the features that are part of the base install; widgets, and change them whenever they
Navigation and operation: 
Navigation and all the operation you can do inside your blog are possible thanks to widgets, tools or content you can add/remove from the sidebar of your blog. These tools allow you to manage you webspace and to personalize it. They are very easy to use a
How to use it: 
Enter the wordpress website (www.wordpress.com) and sign in. Choose a domain name for the blog that is the address visitors have to use to see your blog. After receiving the activation link on your email, you can start creating your own blog. If you just want to comment blogs from others users you just have to select “sign up for just a username”. After signing in, you can see the tab “My Blog” in the top of the page, that allows you to enter the blog associated to your email address and to quickly access your dashboard. After entering your dashboard you can start creating your blog site by using the two menus wordpress offers to your right: one for manage all the powers of your blog and the other one is the toolbar across the top of your blog
Examples of use: 
Creation of e-portfolio: Students can use wordpress to create their own e-portfolio and share it with other people. Teacher have to train their students about e-portfolios, its purposes, and how to create, also showing them some templates or existing e-portfolios. The e-portfolio can be shared and discussed collaboratively.
Other issues: 
It is possible to open or close individual pages for commenting and the level of access/privacy for each blog.
Useful tips: 
Other useful link related to Wordpress are: Blogger Tumblr