Biology Online is a life science reference site that features sections for forums, dictionary, articles, tutorials, and directory of internet sites. I find that the dictionary is the most useful area of the website. Without a textbook to refer to, my students struggle finding scientific definitions to their vocabulary words. I direct them to this site because I know the definitions they find here will be in terms of biology. General dictionary sites give non-scientific meanings to words that can be confusing. I also enjoy exploring the directory of internet sites which has many subcategories and offers content on every aspect of biology.