How to create template file for specific node? As I asked above is it possible to create template file for specific node id.
I now we can create template file for content type, but not clear for node id.

E.g. Suppose there are 10 Articles in website, each has node id from 1-10.
Now question is I want to create template file for node id 3. When user visit article node id 4, then user will see different page.
In Drupal 7, you can use node--[node-id].tpl.php for theming specific nodes. In your case, you can use node--3.tpl.php.