How is text mining helpful to businesses? What is the benefit of counting words and creating clusters in text mining? In the video of text mining, why do you think the count for dog/s and cat/s changed after enabling stemming?

How is text mining helpful to businesses? What is the benefit of counting words and creating clusters in text mining? In the video of text mining, why do you think the count for dog/s and cat/s changed after enabling stemming?