These are the brief descriptions that show up in the Google results. They are usually 120-155 characters long. These help Internet users decide whether to click on your site or move onto the next one. Just like title tags, you can and should create a unique title tag for each page and post on your website. You can easily do this on platforms like Wix and Squarespace or using the Yoast plugin for WordPress websites.
Google Business Profile Categories List
Here’s the full list of all 3,000+ categories for Google