What is Preact?

• Preact is a 3KB alternative to React with the same API (compared to React's v15 ~80KB gzipped, React v16 ~40KB)

Differences to React

• ​Doesn't have Synthetic Event System - uses browser's native event handling 
• Follows the DOM specification more closely (Eg: className in React vs class in Preact)
•  Doesn't have PropType validation
• Preact-compat : Compatibility layer to use react based modules (includes PureComponent, memo, Portals etc)