eHow is an online how-to guide with more than 1 million articles and 170,000 videos offering step-by-step instructions. eHow articles and videos are created by freelancers and cover a wide variety of topics organized into a hierarchy of categories. Any eHow user can leave comments or responses, but only contracted writers can contribute changes to articles. The writers work on a freelance basis, being paid by article. eHow is frequently called a content mill. Demand Media and eHow in particular have been criticized for large amounts of low-quality content and for operating as a content mill, paying contributors low rates for content intended to rank high in search results, rather than focus on quality information, with poor quality articles intended mainly to drive up search results rather than inform, specifically by targeting the long tail search results missed by other sites, a category considered by Google to be a modern update on spam.