In a nutshell, it means the OS's foundation stays untouched, with changes happening around it rather than inside it. While ...

Immutability is a feature of functional programming languages that makes programs easier to write, test, and maintain. However, immutability is not supported by many imperative programming languages.

Immutable X has launched today as a platform for games with nonfungible tokens (NFTs). That means that those games will have uniquely identifiable digital items that players can earn or buy or sell, ...