PageRank is Google’s historical link-analysis concept: links help model importance, but the retired Toolbar score cannot guide current decisions.
PageRank explains why links became central to web search: they can help discover pages and model relationships. It is not a public score a site owner can query today, and it is only one part of modern ranking systems.
Practical implementation
Use the concept to review architecture: important content should be linked from relevant pages, dead ends should be removed, and pages should not exist only for a link graph. External link work must remain editorial and policy-compliant; PageRank cannot be configured directly.
What to verify
Review rendered links, target statuses and paths users and crawlers can follow. Label third-party authority numbers as proprietary estimates and observe discovery separately from link-graph review.
Common mistakes
Do not promise that one backlink, link count or score change will cause a ranking movement. PageRank is not a visible dashboard value.