What is Permalink?
A permalink is a permanent link to a Web page. Think of it as the digital version of a "street address" for a Web page. Instead of having to remember or bookmark where your page resides on the World Wide Web (WWW), a permalink makes it easy to link directly to its location and return later.
What are the Benefits of Permalink?
A permalink allows readers to refer directly back to your article, and to cite it in other articles. This increases your chance of getting read by people who were not there when you wrote the article, which is important since most scientists are not famous like Prof Robinson or Prof Dawkins. So a permalink is really worth putting in those 75-100 characters at the bottom.
If you want to read more about permalinks or how to add permalinks in blogger? So you can also learn this posts also What is Permalink? How to create Permalinks in blogger?