What is Ethereum Plasma in Layman's Terms?

[Colorblind]

Okay so I was stuck reading about recently announced Ethereum Plasma but can't quite grasp the idea.

From what I understood Ethereum seeks to implement Map Reduce (I still not fully understand what it is) methods to outsource execution of smart contracts to as many nodes as possible (like it's done in clusters - 1 node will be in charge and distribute small tasks to many other nodes and upon execution, result will be bublished by that node). However it's not very apparent for me how this will make network faster and trustworthy?

Could someone with in-depth understanding of Plasma Whitepaper explain it in Layman's Terms for less technically advanced people like me?

Thanks!