Bitcoin account security has three most important factors: private key, public key and address.

Just as bank withdrawals and online banking transfers require a password, so does bitcoin in your wallet. This password is called "private key".

The "private key" corresponds to the "public key", which is like your bank account. Each bank account has a unique account number, which is the bank card number. In the bitcoin network, the bank card number is the "address". As long as others know your "bank card number" (i.e. address), they can transfer bitcoin to you.

In a bank, the process of opening an account is basically "opening a bank account - giving a bank card number - setting a bank card password - opening an account successfully". But in the blockchain world, it is first to set a "password" (private key), then to open a "bank account" (public key), and finally to give a "bank card number" (address).

If you pick up a note on the road, it only says the bank card password, but does not write the bank card number, even if the bank card password is true, you can not take the money from the relevant account.

(2021-3-22)