Lightning is an open source retail payment system built on top of Bitcoin. Its main purpose is to enable extremely fast and cheap payments, much faster and cheaper than regular Bitcoin transactions, while retaining the same level of security.
It is used for the kind of payments that you would expect when shopping; fast, cheap and reliable. It also allows for micro-payments: the sending of extremely small amounts of money, in the order of one ten-thousandth of a cent at a time.
Wallet of Satoshi is a mobile app for iOS and Android that lets you send and receive Lightning payments.
It is a zero-configuration custodial wallet with a focus on simplicity and the best possible user experience. It can be downloaded using the links at walletofsatoshi.com
Simply download and the app and you are on the Lightning Network!
You are still early, but the list is growing all the time. You can: