Minecraft's Redstone system is a very powerful tool that mimics the function of real electronic components. This makes it possible to create actual computers in Minecraft using only Redstone. In this video, I briefly explain the electrical engineering and computer science principles behind such inventions.

Sources:
Mattbatwings's Redstone Computer:
   • I Made a Working Computer with just R...  

SebastianLague's video explaining how computers work:    • Exploring How Computers Work