A static website consists of a series of HTML files, each one representing a physical page of a website. On static sites, each page is a separate HTML file. When you visit the homepage, you are viewing only the actual homepage file.
Even if two pages contain a chunk of identical content like a footer, the footers exist as two separate versions. So, if you want to update the footer, you must do so on each page.
The difference isn’t obvious when you’re just looking at a website in your browser, but it can heavily impact the functionality of your site—including how easy it is to maintain.
Since static Web pages contain fixed code, the content of each page does not change unless it is manually updated by the webmaster.
This works well for small websites, but it can make large sites with hundreds or thousands of pages difficult to maintain.
Therefore, larger websites typically use dynamic pages, which can be updated by simply modifying a database record. Static sites that contain a lot of pages are often designed using templates. This makes it possible to update several pages at once, and also helps provide a consistent layout throughout the site.