snip is an innovative structured data plugin for WordPress that adds JSON+LD formatted snippets to your website. This is needed to help search engines understand the content on your page and give them explicit clues about the meaning of it.
Some of that structured data will show so-called “Rich Snippets” or “Rich Search Results” like stars, images and a lot more. Not only will this push your search results forward, but using structured data is also a ranking factor of all major search engines, too.
This is the same plugin or theme as distributed by the developer, the developer link is provided above.