Page Rank is an algorithm used by Google Search to rank web pages in their search engine results. It's named after Larry Page, one of the founders of Google.

Key points:

- Measures the importance of website pages

- Based on the quantity and quality of links to a page

- Scores range from 0 to 10, with 10 being the highest

- No longer publicly visible, but still a factor in Google's ranking algorithm

Importance:

- Influences search engine rankings

- Helps determine the authority of a website

- Guides link building strategies