Node modules, NPM started as node’s package manager.
NPM makes it easier for Javascript developers to share code. This makes code reusable for many developers outside of your organization or even from within. Usually these are called “modules” or “packages”. The projects you develop can be dependent on many packages at a single time that individual tackle different problems. Each package is ideally small and focuses on a tiny set of problems that it solves. Because the focus is on only a small set of issues that it resolves it allows for the package to do it very well as the developer is focused on less.
By combining these packages you can create larger solutions to bigger problems, quicker. By utilizing these packages you remove the strain of building solutions to every problem on your. This packages act as building blocks to your project which will greatly increase your development speed and accuracy.