https://www.cnbc.com/2018/11/06/how-to-use-apple-siri-shortcuts-on-iphone-and-ipad.html

When Apple launched iOS 12 in September, it also introduced a new application that gives Siri new powers.

It's a new app called "Shortcuts." You can use the app to create all sorts of custom shortcuts that Siri will do when you speak special commands.