what is npm run build explained

 npm run build is a command that is used in the context of a Node.js project that is managed by the npm (Node Package Manager) tool. The command is typically used to create a production-ready version of the application that is optimized for deployment.

When you run npm run build, npm looks for a "build" script in the scripts section of the package.json file, and then executes the command specified in that script. The exact command that is run can vary depending on the project and the development environment, but it typically involves a process of compiling, optimizing, and minifying the application's source code, as well as any dependencies or assets, into a single bundle that is ready for deployment.

The output of the npm run build command is usually a set of static files that can be served by a web server or deployed to a cloud service, such as AWS or Google Cloud Platform. These files are typically smaller and more optimized than the original source code, which can result in faster load times and better performance for the end user.

In summary, npm run build is a command used in the context of a Node.js project that compiles, optimizes, and minifies the application's source code and dependencies into a production-ready bundle that is ready for deployment.