A public-private key pair is essential for secure transactions. The public key is like an address that anyone can see and use to send funds. You can share this key freely without compromising your security.The private key, on the other hand, must be kept secret. It is used to sign transactions, effectively proving ownership of the associated funds. If someone gains access to your private key, they can control your assets.When you want to send funds, you use your private key to sign the transaction. This creates a digital signature that confirms you have the authority to make the transfer. The transaction is then sent to the network, where others can verify it using your public key.This system ensures security and trust without needing intermediaries. The public-private key pair allows for secure communication and transactions, making it foundational to many systems. Being careful with your private key is crucial because losing it means losing access to your funds.