There are two kinds of web sites: Static sites contain pages of information whose content doesn't change; Dynamic sites contain database-driven pages where the data can change depending on choices made by the user.

In a static website, to implement a one year calendar, you would need 12 static web pages, one for each month. If you want to add an event in March, you would have to open the March page on your local computer that has the software, edit the HTML code, and upload it to your website. If a colleague wants to add an event in March, he would have to do the same thing, except that the copy of the March calendar page on his comuter is now different from the March calendar page that you just uploaded to the site.

In a dynamic web site, simple forms allow users to enter data into a database.The software is already on the site. There is no need to load software onto several computers. This data is then display when requested. A single calendar page on the site will retrieve data for March, or September, as requested by the user. You can update the events for any given date from any computer with access to the internet.