Python packages are used to add supplementary functionality to Python applications. Packages are directories that refer to specific files and modules. These modules are then imported and executed within applications. Businesses and software developers use Python packages to add prewritten code with specific functionality. These functionalities can range from preconfigured physics logic for a video game to machine learning algorithms. This saves time during the development process by allowing software engineers to reuse code. It also reduces errors by minimizing the amount of new, untested code being written.