They are activity triggers. If you go into your SmartThings app, you’ll see them listed there. You can set devices to automate certain functions based on either manually setting the modes or by time.
The other app is the app of the future that they are working on now. Yes it’s available to us, but it doesn’t have much functionality and it’s not ready. You can see the thread for SmartThings Classic versis the new app.
This is the logo for the new app - Do not use right now. No need to.
Thank you for your comment. I was searching for the reason I got a message from SmartThings telling me to click on a banner to upgrade to the new app, but there was no banner to click on. I looked through the SmartThings app and saw nothing. Your comment saved me a lot of grief. I will wait until the new app is finished before I download it