It is an HTML tag (label) used in web page design that allows the designer to make comments within the code of a web page without it being seen in a browser. It is very useful for a designer to communicate with other designers working on the same website. The comments tag was created simply to make comments that are invisible to all but the coders. It is used anywhere within the code of a web page as follows: <! - - here you can write a comment that will be invisible to the public - -> There are web page optimizers that recommend using keywords within these comment tags. We at Higher Positioning doubt the effectiveness of this practice. The main search engines know the purpose of these tags very well and we don't think they give them much importance. Well, they were not created for netizens browsing the web but for coders. And although we do not believe that a search engine will penalize a website that uses keywords within these comment tags, the time it would take to create them can better be used for more important things that really add value to our websites.