When you hit the windows key (aka meta-key or super-key) it brings up the app launcher. You get a dock at the bottom with pinned or running apps (like a taskbar), and all of your open windows are presented in a sort of mini-version that lets you switch between them or move them between workspaces. There is a search bar that you can immediately type into to open any app with a .desktop file. There is also a button to bring up the app grid which shows your apps kind of like a mobile device’s home screen.