
There are several types of meta tags that can show up in the source code of a web-page. They are used to describe the contents of a webpage in order to make it easier for crawlers to understand it.
Meta tags are elements of website content that are used to describe a webpage. Meta tags cannot be seen by users on the webpage itself, only in the source code. The primary purpose of these tags is to help the bots that crawl the website better understand what the content is about. Also, the content for some of these tags is visible in places like Google SERP or the internet browser tab. In this regard, they can also be helpful for users, not only crawlers.
The use of meta tags is very important and it is recommended to insert relevant keywords in some of them, as they are one of the first places where search bots look for retrieving information about the webpage, enabling it to rank higher in searches for those keywords. However, using meta tags is not compulsory.
There are several types of meta tags webmasters use, but only some of them bear any relevance for search engines. The main types of meta tags are:
Other meta tags include:
<meta name="viewport" content=”...”> - this tells the browser how to adapt the website to the device screen size.
<meta name="author" content="...”> - gives credit to author(s)
<meta property="og:type" content="...”> - this one is an example of meta content for the Facebook bot, etc