A blog is a website where an individual regularly posts written content, photos, and links. Blogs are used for self-expression, self-publishing personal journals, sharing information and resources, building community, providing entertainment, and marketing. Common blogging platforms include WordPress, Movable Type, Radio Userland, and Blogger. Setting up classroom blogs can integrate technology into teaching and help students share work. Popular blogs cover topics like news, sports, cooking, entertainment, gardening, parenting, politics, media, climate change, and more.