search engines:
- google
- bing
- DuckDuckGo
- Yahoo
- brave search

various browsers uses various search engines as default
but usually you can choose another one

- - -

structured data markup

is a standardized format for providing information about a page and classifying the page content

it helps search engines
- to understand the content of your page
- to create rich snippets in search results

one common format for structured data is JSON-LD - JavaScript Object Notation for Linked Data

it is valid for all browsers (all search engines)
because - it is essentially javascript code embedded in html
even if an old browser doesn't directly interpret the JSON-LD for display purposes, it won't break the page

rich results or rich snippets

- reviews
- recipes
- events etc

validate
search.google.com/test/rich-results

no items detected
the tool didn't find any valid structured data - like Schema.org markup - that it could use to generate rich results

- - -