Because pages accumulate. A guide is written, then a landing page, then a blog post on the same theme, each by somebody unaware of the others, and the engine has to pick.
Cannibalisation is two or more of your pages competing for the same cluster, splitting signals so neither ranks well.
Detection compares which pages surface for a cluster's queries over time. Where several alternate or rank adjacently, both are named with their impressions and positions.
Two guides answer one question, alternating between positions nine and twelve. The report shows both, what each covers, and which earns clicks — enough to decide which becomes canonical.
It will not merge or redirect anything. Which page survives depends on backlinks, brand and content quality, and that judgement stays yours.
The mapping, both page records, and the internal links pointing at each, since links are usually part of why the split persists.
Not always — Growth shows the pattern rather than declaring it.
It shows which earns more clicks and links; the decision is yours.
Yes, and it stops being reported.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.