Can you explain what is meant by the process in a Unix-like operating system?

In Unix-like operating systems, a process is an instance of a running program. A process includes the program code, data, stack, as well as system resources such as file descriptors and identifiers. Each process has a unique identifier (PID) and is managed by the OS kernel. Processes can create child processes, exchange data, and run concurrently, which provides multitasking.