Difference between HTTP & WWW in SEO? Some uses http://example.com , www.example.com , http://www.example.com/ , example.com Which one is the proper to optimize a site? Also, provide me the difference among these 4 types of URL.
HTTP is a internet protocol its Hyper Text Transfer Protocol which is coordinated by WWW that is World Wide Media. In SEO IMO their is not so much difference occurs in ranking factor because HTTP is the rule defined by WWW for the communication and information sharing over the internet and WWW is the found this rule and if you do not type www. before any domain then by default web browser opens that website and consider it that it comes from WWW.
http and www both are different things www.example.com There is no such urls, they will automatically will be transferred to http://www.example.com/ and even if you see a url without http://in google chrome then its just chromes browser programming. You can copy the url and paste it in a notepad and see that there is a hidden http:// that shows up when you paste it in notepad. There is a issue with urls, those urls are : http://www.example.com http://example.com http://www.example.com/index.php http://example.com/index.php all of above urls will open the same site, but crawler counts then differently. This issue is called Canonicalization issue. This can decrease your PR juice is not properly handled. There are only two ways to handle this, use 301 redirection on all 3 urls to the only url that you need be the ONE or you can use the rel="canonical" tag with the original url.
You can also choose a "master" url, with or without the www, in your Google webmaster tools. Google will then credit the juice from the various url combinations to the one you choose.
I think there's a lot of confusion here. http:// is a protocol, it's simply telling your browser what format to expect the data that's coming through. Most browser support a few protocols, from HTTP to FTP, and their secured versions. You can even launch third-party apps using this, like spotify:// or itms:// to load iTunes. It has absolutely nothing at all to do with SEO. Not a thing. Diddly squat. If it's a website, it's going to be http:// Having www. and no www. also makes no difference. A site that uses www. isn't more likely to rank higher than one without, and vice versa. It's best practice to force the user to use one or the other with a 301 redirect (easily done in a .htaccess file). If you had both it used to be seen as duplicate content. Most search engines, especially Google, now do a good job of working out that it's not duplicate content, just a mis-configured server.
Jeez theres a lot of ignorance about this here guys. Google the term canonical URLs and understand the problems with duplicate content on your own domain. Then come back and offer advice!
There is no such difference between http & www in terms of seo. Not write anything in your browser with domain like abc.com. Browser automatically recognize it as website & open it using http & www.
There's more to canonical URLs than having www. and not infront of your domain. Google have said a few times that they can work out whether it's just a case of a mis-configured server, which 99.9999% of the time it is, so they don't penalise you for it, it's simply best practice. I'd advise you get your facts right before throwing statements like that about and slandering good advice.