A plain-language explanation
Page Authority is an external metric from Moz that predicts a specific page’s relative ability to achieve visibility in search results.
Where it helps in practice
Page Authority is a third-party prediction rather than a metric used or confirmed by Google.
The decision before implementation
Use it comparatively within one dataset and do not make score growth more important than page quality.
How to verify the result
Compare trends with traffic, indexing, links and conversion and record the metric provider version.