The map on the far left..
The map on the far left shows the rapid spread of Islam and how it grew quickly. The red shows the Islamic world under Muhammad from 622-632.
The map in the middle..
The map in the middle shows the expansion of slavs in the 700's.
The map on the far right..
The map on the far right shows the Ottoman turks, all of the acquisitions, and the border line for the Ottoman empire.