⟩ Explain Application Pages in SharePoint?
One can create custom application pages to add GUI components in Sharepoint. Unlike site pages, an application page is deployed only once per Webserver. Application pages cannot be customized based on sites, and are based on virtual _layouts directory. Application pages are all compiled together into a single dll and are also used across all sites within a server farm. They are preferred to site pages because of their performance benefits over them and they also support inline code.