Multer and GridFS :- What are these exactly?

I want to understand what exactly is GridFs . Why do we need it . What challenges are solved by it ?

Also explain me about multer-gridfs-storage and gridfs-stream . How can we use one to actually let clients download something on their file-system ?

I know it is a very vast question altogether , it will be helpful enough if you just guide me over them and make me just understand the flow .

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