ReactJS, an open-source JavaScript framework introduced by Facebook in 2013, gained considerable popularity by 2019, surpassing Angular as the most preferred UI framework according to The State of JavaScript survey in 2018. Its key advantages include the ability to create fast, responsive, and user-friendly single-page applications with minimal coding, largely due to its component-based architecture, Virtual DOM for faster rendering, and the reusability of code. Widely adopted by companies such as PayTM, Fiverr, Instagram, and IMDB, ReactJS also supports SEO-friendly applications and offers tools to streamline development processes. However, the framework is characterized by rapidly changing environments, poor documentation, and a smaller ecosystem compared to competitors like Angular and the emerging VueJS, which threatens its dominance. Despite these challenges, ReactJS remains a favored choice for enterprises and startups due to its advanced capabilities and the vibrant developer community supporting it.