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The task view is a task switcher/feature on task bar to view open tasks or to switch between tasks in Windows 10/11.
A virtual desktop in Windows 10/11 is a feature to use multiple desktops on a single machine to segregate your workload on different desktop interface(s) on the same user drive.
Please refer a below mentioned article for your reference.
Multiple desktops in Windows - Microsoft Support
Should you have any question, kindly post it on this thread.