Search Engine term explained
SE (Search engine) - this is a service that helps to search information in the Internet.
Search engines on the Internet there are so many (thousands and more), each one based on its algorithm and themes. For example, there are search engines a search scope which music files or .rpm packages for Linux, or job search for job seekers, medical, news, real estate-related and so on.
United States SEO optimizers usually focus on two main search engines - Google and Bing, which occupy a large share in attracting traffic. Each of them has its own characteristics in the applied algorithms optimization and website promotion.