How does BitCore work?

How does BitCore work?

There are different sets of libraries in https://github.com/bitpay/bitcore

  1. Node - A full node with extended capabilities using Bitcoin Core (what is the role of this node ? As i can see this code in node js . Is this means that bitpay has implemented the bitcoin core in node js ? )
  2. Insight API - A blockchain explorer HTTP API
  3. Insight UI - A blockchain explorer web user interface
  4. Wallet Service - A multisig HD service for wallets
  5. Wallet Client - A client for the wallet service

How do these different libraries interact with the Bitcoin blockchain?

Anyone explain the flow in steps will be highly appreciated.

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