A pillar page is the front door to a topic. Broad enough to cover the subject, structured enough to send readers deeper. Get it right and it carries a whole cluster.
The short version
A pillar page is a comprehensive page that covers a broad topic in full and links out to more detailed subpages. It acts as the central hub of a topic cluster and a strong candidate to rank for competitive head terms.
What makes a good pillar page
Broad coverage of the core topic
Clear sections that link to deeper subpages
Strong structure for both readers and engines
Built to be referenced and linked to
FAQ
How long should a pillar page be?
Long enough to cover the topic properly, often substantial. But depth and structure matter more than hitting a word count.