D - stands for Deployment. This is probably one of the best reason to build apps on SAS! The reason being, there is nothing to provision. Even the most basic SAS platform already has everything you need - a Web Server, an Application Server, load balancing, security (SASLogon), a user base, firewall configuration, SSL, and last but not least - access to your data.
Deployment of any web app then boils down to:
1 - Moving web content (html, css, js) to the SAS Web Server 2 - Importing the SPK (and securing the folder permissions) 3 - Configuration (running any DDL and telling the frontend where the backend was deployed)