Assuming you are referring to the Android operating system, process management is a core component of Android. It is responsible for starting, running and managing applications. When an application is started, it will be assigned a unique ID called a PID (Process ID). The PID is used by the process manager to track and manage the application.
The process manager also uses Linux kernel features such as Cgroups and namespaces to isolate each application from others. This isolation ensures that one application cannot affect another or the system itself. In addition, the process manager is responsible for killing applications when they are no longer needed or when they misbehave.
Android's process management has come under scrutiny in recent years due to security concerns. One issue is that Android allows applications to run with root privileges, which can give them too much power and control over the system. Another concern is that Android's security model relies heavily on permissions, which can be difficult to manage and understand.