How Razer mechanical&optical switches work

I am writing a physics paper right now and I want to write some paper about Capcitor and its use. I saw that capacitor is used to recognize keyboards input, but it was somehow different from how I understood about Razer switches work. So, I want to know how Razer switches exactly work! If anyone see this, please tell me specifically about this subject :) Thx for watching p.s. I am 3rd grade in Korea highschool, so don't tell some deep dark physics... Please tell me easy so that I can easly understand :D