Before deploying the application pages
using sandbox solution let me remind you all guys once again because in my
interviews experience I have faced these 3 types of questions in most
cases. What is mean by "application pages" and where are all the
"application pages" have by default and difference between "site
pages" and "application pages"?
Site pages are customized pages and
are saved into the content database. so when you use the SharePoint designer to
make custom changes it saves the changes in to the content database. if you
want to make generic pages in a site collection which will be used by everyone,
like "settings.aspx"
page then you need to use application pages. In other words site pages are
nothing but customized pages stored in the content, while application pages are
generic pages which will be used by all the sites in a site collection.