“Developers are exploring the use of hierarchical channels to help speed up and make the Lightning Network (LN) more scalable. Hierarchical channels allow for flexible off-chain resizing of channels, enabling quick and cheap resizing, without on-chain transactions which add delays and costs. In contrast, resizing channels on-chain can cause delays of several months and increases fees.”

https://bitcoinmagazine.com/technical/bitcoin-developers-propose-hierarchical-channels-for-lightning?utm_source=carrot&utm_medium=partner&utm_campaign=carrot_share