Snapcraft or Snap is a universal app store for Linux and deliver and update your app on any Linux distribution for desktop, cloud, and Internet of Things.
Snaps are transforming the way install and update apps, working across many distributions and versions of Linux
Snaps are bundling dependencies and config and simplifying installs to a single standard command.
On KDE Neon, You can install snap from Discover, the KDE software center application and From Discover, search for snapd and click Install.
But if you want use terminal, you can install Snap by opening a terminal and typing a couple of commands.
Open Terminal from the Applications launcher,
After launching KDE Neon Terminal, enter the following to install snap:
sudo apt update
sudo apt install snapd