Microsoft Windows gives us the ability to run multiple processes simultaneously - it's called multitasking. Some processes we start intentionally - we call them applications or programs. Other processes are started by the system - we call them services. Keeping track of all of the processes running, at any time, is a major activity.
Microsoft gives us Task Manager, to track the processes. Task Manager lets us choose a total of 25 items that we can learn about each process. This is the original tool that you might use, in watching what your computer is doing.
SysInternals (now another division of Microsoft, but that's another story) gives us Process Explorer, which lets us choose, in a tabbed menu

TaskManagerMain

Task Manager Select Columns

Process Explorer Main

Process Explorer Select Columns Process Image

Process Explorer Select Columns Process Memory

Process Explorer Select Columns Process Performance

Process Explorer Select Columns Status Bar

Process Explorer Select Columns DLL

Process Explorer Select Columns Handle