Meet the Samsung DeX Pad: a handy accessory for your Samsung Galaxy devices that lets you connect them to a monitor and use them like a regular computer. It comes with a built-in fan to keep your phone cool. It features 2 x USB ports, USB-C charging, and HDMI output.
You simply have to dock your smartphone into the DeX Pad, connect it to your monitor, and use your phone as a trackpad. Plenty of apps have been modified to be used in DeX mode.