Provider: supports you, - "has"
Manager: Designates & keeps you, - "knows & manage", it seems that it will manage a family of product and expose services to cusumers
Helper: as to itself, it does not supply services - "has" and not consume services - "use"; but it "knowns & transform" the services and make some transform
examples: as to ORM
dbProvider,configurationManager, dbHelper
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