Every time you add a new blog post or update an existing page with fresh content, you are optimizing the page for your target keywords. This makes your website relevant to your target keywords and enhances the possibility of a higher ranking in the search engines.
Search engines have their own parameters to identify and reward good content. The frequency of adding new content is one such parameter. So you get an added boost when you add fresh content on a regular basis.
Every visitor wants relevant information from a site. You must provide him with a reason to return to your site. If you give them something fresh every time they visit you, not only will your traffic increase but will also serve as a determinant for search engines to give you a higher ranking.
Adding fresh content regularly is essential to ranking better on Google’s search results as well as all the other search engines like Bing and Yahoo.