What is Preact?
Preact is an attempt to recreate the core value proposition of React (or similar libraries like Mithril) using as little code as possible, with first-class support for ES2015. Currently the library is around 3kb (minified & gzipped).
Preact is a tool in the Javascript UI Libraries category of a tech stack.
Why developers like Preact
Lightweight
Drop-in replacement for React
Props/state passed to render
Performance
ES6 class components