Not exactly! But they are related — while JavaScript is a programming language used to build interactive, dynamic web applications, ReactJS, a JavaScript library, is used to build user interfaces. Developed by Meta (then Facebook) and currently maintained by a community of developers, ReactJS is a go-to resource to simplify building complex, robust user interfaces, thanks to how easy the framework makes it to build reusable components.
To recap, the big difference between JavaScript and ReactJS is that React is all about user interface creation, while JavaScript is a more encompassing and general-use programming language. While they can be used in concert, they also are frequently used separately.