What is the difference between the server side include (SSI) and JSP include?
Answer by Alessandro A. Garbagnati
Theoretically they are very similar. The purpose of both is to include a page or a document inside the actual page, before sending the page back to the client. Both works on the server. Said so, the obvious difference is the technology behind the two different solutions.
The basic SSI implementation (that is normally part of a web server) it's definitely less powerful of a jsp include. The SSI has only access to the same request object of the page that contains it, while with jsp include you can use the same request or even add more information.