One of the key factors to make a site popular is to offer good quality and unique content to the visitors. Search engines just like a library, people go there and look for the information they need. A website is like one of the thousands of books sitting in the library, the more frequently the book borrowed by people, the more important it would be. Same in search engine marketing, in order to make your site rank well, content rich and well organized are a must.
SEO Tip of the Day : Content is King