Re: Is the Blockchain.Com is Bitcoin Blockchain or the Bitcoin Core QT ?

Where exactly Bitcoins are Stored in the database ? Is it in the Bitcoin Core QT or in the Blockchain.Com ?

Can any one explain me please ?

Neither.

I suggest you try to comprehend this site, it offers a manageable explanation for newcomers, https://learnmeabitcoin.com/ and Beginners Guide: An introduction to bitcoin.