What is "meta-tags"
Meta tags are HTML elements used to provide metadata structured on a web page implemented in the section <head> of a document.
Example of Meta tags:
<head>
<meta charset="UTF-8">
<meta name="description" content="Tutoriais grátis online">
<meta name="keywords" content="HTML,CSS,XML,JavaScript">
<meta name="author" content="Stack Overflow">
</head>