Why someone will use the "Gatsby" for building professional websites?

Gatsby enables developers to build fast, secure, and powerful websites using a React-based framework and innovative data layer that makes integrating different content, APIs, and services into one web experience incredibly simple. Gatsby gives frontend teams the tools and technology they need to build world-class web experiences. From marketing sites, to eCommerce stores, to documentation. Gatsby can help you build it. Gatsby automates code splitting, image optimization, inlining critical styles, lazy-loading, prefetching resources, and more to ensure your site is fully optimized. No manual tuning required.