I'm new to Ubuntu, and I installed IntelliJ, Android Studio and Unity3D
Now Unity3D used a .deb file and thus is listed in the dpkg and apt, and Android Studio, while not coming in a deb file, created a shortcut into /usr/share/applications, so I get how the x11 and Unity (the desktop GUI) is able to show it when I search for it. But I can search for IntelliJ, and the search bar does show it as an application, but I was not able to find it either in apt nor the /usr/share/applications folder, so I'm simply wondering how the GUI knows that it is installed.