After installing Windows with BootCamp Assistant, you can use Windows or MacOSX to start your computer.
BootCamp is mainly used to install and run Windows system and Windows-based application software on Apple Mac computers based on Intel and its own M-series processors, so that users who are not used to using Apple MacOS system can also use Windows system to operate.
BootCamp software has been built into MacOSX 10.5 and higher versions of the system, and now Apple computer users can generally find this tool in their own computers.