content: It is like an electronics kit with premade components (aka LUT) and all you need to do is wired it the way you want: https://www.youtube.com/watch?v=QqRXXaB2Y5M The difference is that you create the wiring of your choice by a program.  Imagine that this Kintex-7 FPGA contains 308 such Electronic Learning Lab Kits on one chip and an excel spreadsheet tells the Kintex-7 FPGA how to wire the connections.