Site Definition VS Site Template

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SITE DEFINITION VS SITE TEMPLATE

Site definition

  • A site definition is the basic blueprint for a site, including how it looks, what lists it contains, default navigational structures, and so on. 
  • A site definition consists of .aspx pages and .xml files with Collaborative Application Mark-up Language (CAML).
  • A site definition is installed on file system of web front ends, located at ..\12\Template\SiteTemplates. This directory is language-neutral.

Site template : 


  • A site template can be created from within the Sharepoint application, A site template (*.stp file) is created through the user interface or through implementation of the object mode (example-taking backup of a site)
  • The site template package is a package containing a set of differences and changes from a base site definition
  • A site template is based on the underlying site definition, which means that if you create a new site from a template, and later change the underlying site definition, you run the very real risk of irreversibly screwing up your site.

Difference : 

Site Definitions
Site Templates
Files are on disk, better performance.Files are in database, less efficient.
Highly customizable and extensible (XML  and .NET code is much more flexible than UI)Not easily extensible  (You are limited by what UI offers)
Can provision multiple webs *Can only provision one web
Complex to createEasier to create
Requires admin access to server for deploying.Installable from a Web UI by site owners.
Modifying the site definition after provisioning at least one site from it is not supported and might break existing sites.Custom templates can be modified without affecting existing sites that have been created from the templates(**).

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