Bitcoin is a digital currency and can be used for many different types of transactions, from buying goods and services to sending remittances and transferring money. The Lightning Network is a layer 2 payment protocol that is built on top of the Bitcoin network and allows users to send and receive payments with much lower fees and faster transaction times. It can be used to create micropayments, streamline commerce, and improve scalability. Generally speaking, Bitcoin should be used for larger transactions, while the Lightning Network should be used for smaller ones.