KDE Plasma's KRunner is a handy tool: How and why you should be using it
KDE Plasma is exactly what you would expect from a desktop. It contains all the pieces and parts any Windows user has come to know and depend on.
It includes a taskbar, system tray, clickable desktop icons, a desktop menu, and all of the usual items that help make interacting with your computer a breeze.
Of course, KDE Plasma has a few more tricks up its sleeve than Windows. One such trick is called KRunner.