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meta tags contain data for SEO. Using these tags having keywords and description of pages search engines get information about the site and pages.
Metadata is data (information) about data. The <meta> 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.
Although most SEO tutorials mention that Meta keywords and description are not used anymore, yet they are! Keywords are the first thing search engines look for, yet description is what shows when you search a website underneath its title, author is for credibility and to keep your name on the web as the developer of the site so you can use it in your portfolio
Meta tags are used for display about your web retaliative to which section etc. And it's also important for SEO. when you search anything on google, the website with keywords (in bold letters) and descriptions are also shows down of that keywords. So in short they are essential for helping the web to be prominent in the world :)
For searching the specific keyword and for title we used meta tags
In static website Meta Tag is not compulsory.. Meta Tag used for dynamic Websites.. it's use on head section.