Similar to Windows operating system, running processes also consumes system resources on Ubuntu machine. If you want to find-out the processes that consumes alot of resources like CPU and memory usage then you can list running processes in Ubuntu in couple of ways. First from the command line, you can use "ps -ef" to show every (-e) running process in a full (-f) detailed list. You can also use "top" command if you want the list be updated in real-time.
Below is a screenshot of the result of "top" command.
The top command shows all running processes and can order them by memory or CPU resource usage. It refreshes every few seconds unlike ps which just provides a single snapshot of the currently running processes.
Second, If you want a graphical view of the system processes like the Windows Task Manager then use System Monitor (System>Administration>System Monitor).
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