Glossary
Structured data
Definition
Structured data is machine-readable markup describing what a page contains.
Signal against source
Search engines use it as one ranking signal among many. AI answer engines increasingly use it as a source — reading it directly to build an answer.
That shift is why it must describe visible content. Marking up something a reader cannot see forfeits the benefit and risks a penalty.
More terms
Age assurance
Methods used to establish or estimate a user's age before granting access.
School starting age
The age at which compulsory schooling begins — four in the UK…
Freshness signal
Evidence that a page has been recently published or updated.
Youth bulge
A demographic structure where a large share of the population is young.
Youth dependency ratio
The number of people under 15 per 100 people of working age.
Population pyramid
A chart showing the size of each age band, split by sex,…