Blog is short for "web log" and is an online journal where you can write or post about whatever you like. Many people use a Blog to display life events, political opinions, information on a great trip, favorite recipes - anything at all. But the main reason a company would usually use a Blog would be for viral marketing purposes.
Active Blogs can help with Search Engine Optimisation and help to drive more users to a website. Blogs usually comprise of one or more blog entries and can include words, photos, hyperlinks etc. Each blog entry would usually have its own title and display the date and time the blog entry was published.