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Window handle is a unique identifier that holds the address of all the windows. Therefore, the window handle can be used to check if a popup dialog is a window or not:
         print(driver.window_handles)
         print(driver.current_window_handle)

In some cases, the popup dialog is not a window, but it is just a HTML dialog. Therefore, you can treat it like any other HTML on the page and get its contents. If it is a compound class name, then it contains more than one class. In this case, a CSS selector can be used to find elements with those class names.         

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window_handles and move_to: code:             
                  
      Steps to build the code:   
                   
       Get the following after clicking inspect: 
         
        Righ click the line above:  
         
       Once the line below is performed, then the second window will open:
              driver.find_element(By.XPATH, "//*[@id='Tabbed']/a/button").click()
Output:         
         
          After those lines below, then a window is closed as shown in the image below:
                   if driver.title == "Selenium":
                         driver.close() # Close the particular window