Bundling is a new feature in ASP.NET 4.5 which helps to makes it easy to combine or bundle multiple files into a single file and we can also create CSS, JavaScript and other bundles for increase the performance of code and reliability of the codes. Bundling helps us to manage our stylesheets and scripts files in a more easy mode. It also helps in reducing the network traffic by optimizing the request processing in other words reducing the number of calls for downloading the scripts/CSS files from the user to the server and vice versa. Bundling helps us to merge all the files in a single request from the server to the browser. In web development when the project is done then all the files are store in Bundling in Bundle. file.