what is the meta tag uses

Please tell me the what is the uses of meta tags

Meta tags are the base for the SEO in on-page optimization techniques. And it will be very helpful to make our keywords more optimized and improved page ranking.

The tag provides metadata about the HTML document. Metadata will not be displayed on the page, but will be machine parsable. Meta elements are typically used to specify page description, keywords, author of the document, last modified, and other metadata.

Meta tag is used to give basic data about the html document which can't be done using other tags.These tags aren't displayed in the document. Meta tags are also used to redirect to some different page, http attributes like http-equiv, charset, etc.

Meta keywords is essentially a worthless tag that is no longer used by most search engines, as it was a method abused by spammers in the past (in the days of the meta crawler when you could type any term in and still be served porn). Bing still takes them into account as a signal for spammers not ranking! I always look at competitors meta-data in order to give me a quick overview of their targetted terms, so I would think about ditching them if I were you, though don't panic if you don't., just don't give precious time to them..

The tag provides metadata about the HTML document. Metadata will not be displayed on the page, but will be machine parsable.
The tag is used to provide such additional information. This tag is an empty element and so does not have a closing tag but it carries information within its attributes.

Meta tags is used to provide information about your website on Google SERP.

Meta tag is most important tag for any website for promotion point of view. you should use the all the meta tag which is required for promotion such as meta title, description, keyword, and many more.

Meta tags are the words that will get reflected at the top of your browser.
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Meta tag provides metadata of the web page. Metadata will not be displayed on the page, but will be machine par sable. Meta elements are typically used to specify page description, keywords, author, robots, revisit after and other metadata.