How does Word count the number of words in an article?

How does Word count the number of words in an article?

1. If we see this article on the Internet, we need to copy it first.

2, we open the Word document, the above copied text paste in.

3, there is a "tool" above the Word document

4, we select the top of the "tool" and then click "Word Count"

5, click on "Word Count", Word will automatically count the number of words in the document, will be displayed "paragraph count", "line number", "word" and other information.