PageRank Sculpting is an SEO strategy that involves controlling the flow of PageRank (a Google algorithm metric for valuing web pages) around a website. This is done through the strategic use of nofollow tags on internal and outbound links to direct more value to specific pages and improve their ranking potential. While once popular, changes in Google's algorithms have made PageRank sculpting less effective, and the focus has shifted towards creating quality content and natural link profiles.