Marko.js is a modern UI library developed by eBay, designed for building high-performance web applications. It focuses heavily on server-side rendering (SSR) and is known for its speed and efficiency. Unlike some other front-end frameworks like React or Angular, Marko excels in server-side rendering out of the box, which is beneficial for SEO and fast initial load times. Marko's template syntax is also quite clean and expressive, making it easy to write and understand.
