Just think "Platform as a Service" but open. I don't know what "platform as a service" means. I watched the video on the right side of the page, and I still do

Just think "Platform as a Service" but open. I don't know what "platform as a service" means. I watched the video on the right side of the page, and I still don't understand. Edit: I looked it up on Wikipedia. I still don't really get what this is about.