Programs built with Electron are written in HTML 5 packaged by wrapping Chromium around it. People's main beef with Electron is size (of the binary) and memory usage. Since you're technically running a whole webbrowser (just with 1 "tab"), it's quite heavy. Think of a simple calculator app taking 50 MB of disk space and using 150 MB of RAM
A lot of programs these days are built using Electron, or similar techniques (packaged HTML 5 app) partly as it's a quick way to build an app that's cross platform and has a lot of functionality
A lot of programs these days are built using Electron, or similar techniques (packaged HTML 5 app) partly as it's a quick way to build an app that's cross platform and has a lot of functionality