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This question already has an answer here:

Now if the question is stupid forgive me.

From what i have understood so far( i could be wrong )

  1. Bitcoin is a digital currency service.

Q : What is difference between coinbase.com,blockchain.info and thousand other sites who give me a unique bitcoin address upon registration ? Also are those bitcoin address unique globally or per site ?

  1. You can earn money by bitcoin mining ( letting a software solve some complex mathematical problems in your computer)

Q : why do we need to solve a problem ? cant it have like a database which checks id/password combination like paypal and others on a server ?

marked as duplicate by Jestin, Murch Mar 24 '17 at 14:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • I flagged this is a duplicate because of your second question. As for your first question, you should do a little more research on your own. You clearly don't have a good concept of Bitcoin yet. It might be smart to check out bitcoin.org first, and then post specific questions you have when you need clarification. Welcome! – Jestin Mar 21 '17 at 20:23
  • I've closed this as a duplicate, because two of your three questions are answered in the linked questions comprehensively already, and the third strikes me as a product review question. – Murch Mar 24 '17 at 14:44
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Q : What is difference between coinbase.com,blockchain.info and thousand other sites who give me a unique bitcoin address upon registration ?

These websites are competing web wallet providers. You can also use a mobile wallet or a desktop wallet. bitcoin.org has a list of good options.

Also are those bitcoin address unique globally or per site ?

Each generates their own addresses, but you can send money to someone who uses a different wallet provider by sending it to one of their addresses.

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