SSI stands for Server Side Include. To do this short!
Maybe you have an www-page with a menu at the left. You have a lot of pages and to put that menu on all pages could take some time, special when you have to update the menu. You must do the changing on every pages, it takes time and itīs easy that something goes wrong.
So, put your menu in a separate file/page and then just include it to every pages you want the menu to appear. When you have to change something, just do the changing in the included file and it changes on every sites.
Your server must support ASP-pages (dynamical) to use SSI.
I hope that you understand my english. If you want I can do a little SSI-demo and send it to you...
Edited by jabbasabba