Preact is a fast, lightweight alternative to React. It has a similar API to React but with a much smaller footprint, making it well-suited for websites where performance is critical.
Preact is a lightweight user interface library that aims to provide the performance advantages of React while maintaining a small code size. Preact is built on top of the Virtual DOM mechanism that React uses, but is much faster and sits at around 3kb so it can be used on mobile devices and slower networks.
Some key characteristics of Preact:
Preact is commonly used when building Progressive Web Apps where speed and efficiency are top priorities, as well as for sites targeting geographical areas with slow networks. Its small size makes it suitable for all types of web projects though.