Eli5, series A,B,C funding

Also you can have many rounds under the same letter. So you can have series A 1, A 2..... Its very hand wavy. I think the letter usually corresponds to the stage of the start up and how much they are looking for. Seed usually for building the proof of concept to mvp. A from MVP to getting a good customer base. Usually capturing your beach head market. B is when you start scaling and focusing on growth. C is when yo start forcing on being profitable.