You might be surprised to know that although Google doesn't pay much attention to meta tags nowadays, they are still important as a ranking factor in Yahoo and Bing.
Yes.. it's actually part of on-page optimization of a site. Meta tags is one of the means for the search engine spiders to determine what the content of a certain web page is about. Ten years ago meta tags used to be very effective for Google search ranking until it got abused by spammers. These days meta tags *may* still be helpful if you're targeting not-so-competitive keywords to outrank your competitor's site who's one or two position(s) above you in the SERPs. For instance, if you rank #14 in the SERPs for a particular long-tail keyword phrase and you want to be in #12 position, meta tags might help you, provided your competitor (in the #12 position in the SERP) has got equal or lower number of backlinks compared to the number of backlinks you have. Having said all these, you don't need to pay much attention to meta tags as there are many other important factors to rank higher in the search engines.
Meta tags now a days are only good to have, just to be more professional with things you can say, else it has no importance in search engine eyes
because: 1. there are another search engines other than google 2. when bookmark, some bookmark site will get summary from the meta
Meta tags are helps to know more about the pages. If we added targeted keywords in the meta tags then it helps to get better ranking for that keywords...
The main thing is that your meta description is visible in Google's SERPS (the green text under your title) and if it's a good appealing text, then searchers are more likely to click your site - that is meta description is good for your click-through rate.
Not all meta tags are worthless in Google. The Meta Description tag still plays an important role in major SEs including Google.
Yes meta tags specially meta keywords now Google do not give any preference but meta description is still in demand and it is good practice of using these tags in the site.