This static web page is delivered to the user exactly as stored. Static web pages are often HTML documents stored as files in the file system and made available by the web server over HTTP. Consequently a static web page displays the same information for all users. You can not edit your pages if any changes need to be done you have to approach the developer.
CMS or a 'Content Management System' quite literally allows you to control and manage the content within your web site - without technical training. CMS allows you to publish, edit and modify your content. Using this uncomplicated system you can very easily add, delete images and edit text in your web site. You can also have an unlimited number of pages and a full site-search engine.