To send or receive BTC, you’ll require a Bitcoin wallet address, a unique string of 26-35 characters starting with ‘1’, ‘3’, or ‘bc1’. Each address corresponds to a key pair: a public key for identification and a private key for transaction signing. Your wallet address is essentially a user-friendly version of your public key.
For privacy protection, Bitcoin wallets generate new addresses for each transaction, though old ones remain functional. This practice safeguards your wallet’s security, particularly if you use an online wallet vulnerable to key exposure during transaction signing. Hence, most wallets automatically generate new addresses per transaction to mitigate risks.