Google SEO
2011–2016 (27 documented iterations) — Search Engine Land
Why did Panda have multiple iterations?
Panda was a series of refreshes rather than one event. Each reassessed content quality before the system was integrated into the core algorithm in 2016.
Further analysis
Use this entry as an audit checkpoint. The cited source establishes the context; the direct answer identifies what to check before choosing an action.
In SFT, this topic relates to Trust. Check whether the signal is visible on the page, connected to the rest of the website and supported by understandable evidence.
Related search terms include Panda iterations, Panda update history. Use them to describe the issue in a brief, audit or answer page.
Applying SFT
Trust requires observable evidence: sources, consistency, citations, identifiable authors and verifiable claims.