Semantic HTML is not some sort of special form of HTML that require its own syntax. Rather it is a practice or technique of HTML that makes wepages more easily discernable to the web crawling software. This helps with accessibility needs as well as SEO
Semantic HTML History
Semantic markup has been a component of HTML since HTML has been around. It was not until 2001 however that Tim Berners-Lee had a hand in a talk about the Semantic Web. Where as he theorized that one day software “agents”, or as we know today as web crawlers, would find, filter, and correlate previously unrelated, published facts for the user’s benefit. And as the internet has grown, and HTML aged, the acceptance and insistence of use of Semantic Markup has only grown.
When one reflects on Semantic Markup it is easy to see that when done correctly, it truly is the best for all parties. Web developers allow web crawlers to more efficiently identify the topic of their page, and promote it to the correct audiences. And then the web user has a more wide array of information, previously not connnected at all, right at their fingertips. That is also not to mention the additional accesibility that it brings to the web page for those who may be blind and use a page crawler to browse the internet. So, I implore any web devs to be to consider using Semantic Markup for their next project