The <meta> tag provides metadata about the HTML document. Metadata will not be displayed on the page, but will give information to the browser and searh engines.
Meta elements are typically used to specify page description, keywords, author of the document, last modified, and other metadata.
The <meta> tag always goes inside the head element.
The metadata can be used by browsers (how to display content or reload page) search engines(keywords), or other web services.
The meta tag is a self-closing tag. Instead of putting a tag with a slash at the end of the code you just put the greater than sign to close the start tag.
Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.