PoW vs PoS and what happens to the mining ecosystem????

Forgive , but I am totally new to crypto mining. I am sure this question has been asked eight trillion times already but I am going to ask it anyway. Can someone please help me to understand Ethereum 2.0 and PoS. Currently there are massive numbers of people mining for Ethereum via PoW. With 2.0 coming online, who, what and how is PoS used. Do the miners just disappear? Is there still an opportunity for individuals to earn Ethereum other than to directly purchase from one of the exchanges?