A controlled vocabulary is a list of words to tag units of information in a text or document. Controlled vocabularies can be used for information retrieval.
Digital Persona Optimization (DPO) is the process of strategically managing and enhancing a digital persona’s online presence to improve visibility, credibility, and search engine rankings.
A digital persona is the aspect of a [personal brand](./personal_brand.md) that is shaped by the person's online presence, behavior, and interactions on the internet.
Knowledge cards are a grid of small information cards across the top of the SERP. Knowledge cards are only shown for entities in the Google Knowledge Graph.
Knowledge panels are information boxes that appear on Google SERP when you search for entities (people, places, organizations, things) that are in the Knowledge Graph.