The home page for immutable JS briefs the merits of using the library. However, it is a bit difficult to understand. In this section, we will explain the importance of immutable JS in simple terms. The use of Immutable JS is a hot topic of discussion in the frontend community. A couple of important aspects of immutability are that it increases predictability and performance and allows for mutation tracking. In addition to that, immutable JS provides a convenient way to modify deeply nested properties.