Too Long; Didn't Read
The Lightning Network was initially created to solve the scalability problems of Bitcoin, the first cryptocurrency to adopt the system. The introduction of an extra layer above the blockchain would cut transaction costs and save time. However, <a href="https://www.coindesk.com/bitcoin-isnt-crypto-adding-lightning-tech-now/" target="_blank">other cryptocurrencies</a> are now facing the same problems. Examples of currencies planning to test Lightning are Ripple, Ethereum, Litecoin and Zcash. Litecoin is the closest to implementing its own version, as it is currently collaborating with Lightning Labs. Furthermore, Ethereum is currently working on <a href="https://raiden.network/" target="_blank">Raiden</a>, while <a href="https://steemit.com/cryptocurrency/@pandorasbox/trinity-lightning-network-for-the-neo-blockchain" target="_blank">NEO has Trinity</a>. Bitcoin Core Contributor Jeremy Rubin has even stated that the Lightning Network has become essential for cryptocurrencies. Rubin is currently in charge of launching Stellar’s Lightning network.