Text Mining Hack Doubt


Hi Everyone,

I am dealing with text data these days and i found this article https://www.analyticsvidhya.com/blog/2015/09/learn-top-4-hacks-perform-text-mining-faster/ on analytics vidhya platform, in this article i want to try the first two hacks, but i am unable to understand what does the author mean by “tags” and how they are useful in the subject extraction. Can someone please give me an example.