Schema or structured data markup is meta information that you can add to your webpages to provide Google with more details of what your pages are about.
You can include a wealth of information, including reviews, products, events, location and much more.
To implement in your webpages, you would need to generate the code in JSON-LD format and paste into the HTML of your webpages.
The tools listed below helps make it easier for you by automatically generating the necessary code based off your inputs input the relevant fields.
Do try them out!