Title is the heading of the webpage. The sentence or string enclosed between html title tag () is the title of your website. Search engines searches for the title of your website and displays title along with your website address on search result. Title is the most important element for both SEO and social sharing. Title should be less than 50 to 60 characters because search engine typically displays this length of string or sentence on search result. A good title can consist the primary keyword, secondary keyword and brand name. For example a fictitious gaming information providing sites title may be like "the future of gaming information is here". A webpage title should contain a proper glimpse of the website. title is important element as an identification of your website for user experience, SEO and social sharing. So have a nice and catching title.
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Description is the full interpretation of your website content and features. Most often it is a short paragraph that describe what are features and information provided by the website to its visitors. You may consider it a advertising of your website. Although not important for search engine ranking but very important for hits or visits through search engine results. Description should be less than 150 character because search engine shows this length of paragraph on search result. And every page of website should contain an unique description to avoid description duplication. Description is the definition of your website for user experience so form it as complete but short and precise illustration of your website.