SEOmatic allows you to quickly get a website up and running with a robust, comprehensive SEO strategy. It is also implemented in a Craft‑y way, in that it is also flexible and customizable.
It implements JSON-LD microdata, Twitter Cards tags, Facebook OpenGraph tags, Sitemaps of your content, Robots.txt bot directives, Humans.txt authorship accreditation, and as well as HTML meta tags.
SEOmatic populates your templates with SEO Meta in the same way that Craft populates your templates with entry variables, with a similar level of freedom and flexibility in terms of how you utilize them.
SEOmatic works automatically with Craft Commerce 2 & Solspace Calendar as well, providing metadata, JSON-LD structured data, and sitemaps for your Products & Events.
SEOmatic can work fully without any Twig templating code at all. However, it provides a robust API that you can tap into from your Twig templates should you desire to do so.
SEOmatic makes a global seomatic variable available in your Twig templates that allows you to work with the SEOmatic variables and functions.