But perhaps the most significant application of Segwit is Atomic Swaps via the Lightning Network.

In short, Atomic Swaps(AS) would enable cross-chain transactions between two different currencies such as BTC and LTC. There are several advantages to this:

You wouldn’t have to go through the trouble of an exchange to get the coin you wanted.

The fee for Atomic Swaps through the LN would be less than if you bought it through an exchange.

The transactions would be instant.