It is a public ledger to record Bitcoin transections. As the name implies, it is a chain of blocks

Yes, they are interconnected as each block includes the previous hash. It is also known as the "chain of digital signatures". From the digital signatures, the miners can verify the transaction.

Although there is a unique bitcoin adress but tracing it back to reach user is almost impossible.

The Ellipticcurve multiplication is used to generate a public key from the private key but it is almost impossible in the reverse direction. Even with brute-search force, it will take time more than the age of the universe to figure out a private key. Hence the secrecy of the private remains intact in Bitcoin.

Thank you.

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