Both people (usually indirectly) and search engines use meta tags.
Are meta tags critical? Every search engines emphasizes meta tags differently. Google doesn’t let the public know how it uses meta tags. I have noticed that a lot of websites show up on the first page of Google for specific subjects and yet they don’t have any keyword or description tags. So don’t let anybody fool you by exaggerating how important they are for Search Engine Optimization. Search engines index algorithms vary greatly — some assign a lot of importance to meta tags, so it is a good idea to use them.
Meta tags are lines of codes that are built into Internet pages. These code lines can’t be seen on the web browser (but look at what is said about the description tag, below), however, the search engine uses them to group your web pages accurately. They can have either descriptions, titles, or keywords. You don’t have to use descriptions and keywords, however your website will appear strange if you don’t use a “title” tag, because people will have “Untitled web page” in their browsers.
In order to grab traffic, years ago, meta tags would be “stuffed” with repetitive information, or information that has nothing to do with the web page. Search engines still check to be certain that the keywords in meta tags are relevant; however they don’t give much weight to keywords in meta tags, thereby penalizing this abuse. In any case, if you don’t include meta tags, or they are filled with useless keywords, you will not rank well overall.
The “head” section of a web page is where meta tags are found. Some people suggest using only lowercase letters in your tags, and avoid repeating terms within the keyword tag.
Mostly, the real meta tag contents are not visible, but the “description” meta tag’s information will be shown on nearly all of the search engine results as well as the title page when the results are revealed. Avoid repetition of keywords in the description tag, and keep the description text relevant.

