This chapter will explore modules and code splitting in Webpack 5. Modules are a way of structuring content so that code is sorted in sections by function. Code splitting is the method Webpack uses to build these modules automatically; it will parcel off code from your project into modules that best suit the functionality and structure of the completed project. 

The topics covered in this chapter are as follows:  

• Explaining modules
• Understanding code splitting
• Prefetching and preloading modules
• Best practices