PXE, or Preboot Execution Environment, is a network-based booting method that allows computers to start up and load an operating system over a network connection instead of using local storage devices like hard drives. This is particularly useful in environments where multiple computers need to be set up or maintained, as it simplifies the process of installing and updating software. Using PXE, a client computer can request boot information from a PXE server, which provides the necessary files to initiate the operating system. This technology is commonly used in enterprise settings for deploying operating systems and managing large numbers of devices efficiently.