Some developers use the term "dymanic" to refer to websites that use a database to retrieve data and present the same page with different data. This is a huge part of a "working" website. But you can also think of a dynamic website as being one were the content of a page changes periodically regardless of where the background data is retrieved. Social media and social network sites are a great source to create this kind of dynamic content.
Including links to social media like Facebook, Twitter or Instagram on your website can boost interest and help keep your customers on your site longer. This is also an easy way to keep your site current and updated. Whatever you include when you post to your social media accounts will automatically be updated on your site.
At Capri Studios, we included a link to their instagram account. This lets their visitors stay up to date on some of their current projects and adds a lot of interest to their site.