Drag to Pin Windows on your PC
This feature was available as far back as Windows 7, but has some extras in Windows 10.
If you grab any window and drag it to the side, it will "fit" to half the screen. In Windows 10, you have the option of dragging the window to any corner to have the window take over a quarter of the screen instead of half. If you're using multiple screens, drag to a border corner and wait for a prompt signal to let you know if the window will open in that corner.
You can prompt similar behavior by using the Windows key plus any of the directional arrow buttons.