To improve user experience and search engine ranking you must use best URL structure for your website as well as Blogs. It is not good to have Urls like articl15.html with static sites or somewhat like /id?15 in a dynamic website.

Both above forms of URLs discussed above are not good both for your website search engine ranking and good informed user experience. Both forms of Urls do not contain enough information for Users and SEs.

In fact you should have the URL structure for your website which include main keywords in filename like /keyword-research.php or /keyword-research.html. Just examine both how good information this URL structure provide to both users and search engines to have a clue what about this page is.

This can be implemented easily by using plugins almost every Content Management System have. Like in Wordpress you use Post Slug option. To use the best structure of URLs for your website or blog, will certainly result in increased website traffic.

Do you sincerely want to increase the website traffic, use this website traffic tactic of having best structure of URLs and your will be get benefited by improved Search Engine ranking and also users will be more willing to click the link because the link itself will be telling about what it is!