SCHEMA
Schema markup, a form of microdata, was introduced in 2011 to
help search engines interpret context of query. You can view every
schema markup type on Schema.org.
Schema is not a ranking factor. And, there is little evidence to
support it has an impact on your search performance.
However, schema does help you stand out in the SERPs with rich
snippet and featured snippets.
For example, in a Search Engine Journal webinar, Milestone shared
they saw a 33-66% boost in search impressions for large fast-food
restaurant chain after schema was deployed.
20 YEARS OF SEO: A BRIEF HISTORY OF SEARCH ENGINE OPTIMIZATION