In fact, that is not completely true. What propelled Google’s effectiveness as a search engine was finding a replacement for the keyword meta tag and replacing that with linking data. If you think stacking the meta keyword tag with everything but the kitchen sink works, forget it. Most search engines now completely ignore this over used and abused meta tag. Some Search engines still do look here for information so adding in a few words from your keyword phrases will not hurt at all. This is one tip of many to maximize your ranking on search engines
Meta description tags are indeed very useful and important. While it may be true that the search engines do not use this tag in any way to determine rankings, they still use them when your web page is displayed in the search engine listings. This is an example:
This description is listed below the title of the page in the search engine listing. This is a key way to engage your customer to click through to your site by reading the description you provide. Treat your meta description like an opportunity to sell your website page in a 160 character sound byte to your customers. It is your chance to tell the searcher you have what they are looking for.
Put keywords from your keyword phrases into the meta description tag where possible in a logical sentence structure. The search engines will bold the keyword, drawing the searcher’s attention to your website. Your description should compel the searcher to click your link because they want to learn more.
Each page on your website should have unique meta descriptions. If every page has the same description, search engines will discount them as being valid thinking that the pages are identical
These meta descriptions also get used on Facebook shares telling the friends of whoever shared your website page, a quick bit about your website and why they too may want to click and read more
Stay away from special characters like question marks(?) or double quotes("). These will cut off your description from showing at all making them useless to you. if you need to use a quote, use a single quote (') instead. The best practice is to use only letters from the alphabet and numbers in the description.
The title tag is a quick way to grab the attention of the web searcher. Utilize your keyword phrases here to quickly describe what the page the searcher will find when they click your link. Make sure your page title is keyword rich and sentence like when read. Your title should be no longer than 70 characters and ideally about 60 for listing and display purposes.