A blog is a website where posts are displayed with the newest first. Blogs often focus on a particular topic and function like online diaries. A typical blog combines text, images, and links. There are two systems for blogging - user-hosted blogs where the user installs software, and developer-hosted blogs where software is installed elsewhere. Creating a blog involves choosing a topic, writing regular posts with a title, body, and date. Blogs can be used for students to express opinions, discuss class activities, and showcase writing.