Blog is short for "weblog." Yahoo allows you to create free blogs and you don't have to know anything about web design. It's a website that is updated regularly and is often used as a sort of online diary. Many blogs have a particular focus such as politics, crafting or being a single mom. But still other blogs are a great way to keep in touch with friends and family by writing about your life. One great feature of blogging is that readers can participate in your blog by commenting.