Is sitemap is necessary ? If I will build huge portal And site is update dailly. My all pages are links each other then sitemap.html page is necessary?
If your site is new, and/or if every page isnt interlinked, a sitemap can be very helpful in getting all your pages indexed by google.. Is it necessary? No
It is not necessary to have a sitemap but having one would make it easier for google to crawl your pages and make it easier for your visitors to find articles that you've written in the past.
Can someone tell me what's the differences between sitemap.xml (the one you submitted to google) and sitemap.html (the one you put on your site)?
Yeah... sitemap is much more neccessary because it ease the search engine tool to spidered your site. It will also make you site available to the search engine sooner.
Incorrect. Submitting a sitemap will not have any impact on how soon your site gets indexed. It will simply HELP to ensure that Google does eventually index all your pages. For example, if you have an orphaned page (a page with no links to it) it would never be indexed without a sitemap.
if your site is not listed even after 2-3 weeks and you have not built up backlinks so you can submit sitemap. It will definitely help in this case. but in no way will it improve the rankings
For Me it is necessary, because a visitor can't find what he/she looking for, he can go to your sitemap page. sitemap are not only use for search engines. it serves as a thorough heirarchial guide in your website.
Two other advantages: 1) When you tell google in your webmaster tools sitemap page that you have just uploaded an updated sitemap, it's been my experience and impression that this puts you on the spiders "visit soon" list. Depending on the timing, this can result in sooner visits. 2) even if you disagree with that, setting up your sitemap page, at least once, gives you ongoing information from Google regarding unreachable pages, estimated page rank, keywords, and other info that Google won't give you other ways.
try using the site DEBUG (something along that line) taht comes with your google adsense. Most likely if you see google bots has problem indexing your page, you may use sitemap.
Not necessary, but I don't think it would hurt. U don't have to list all your pages, just the important ones and that should be enough.
right now, i do not think it is necessary, as I have submitted sitemaps for several sites but it does not seem to work.
Is it necessary? I think so, if not for the people visiting your site who would like to see an overview of your site but also to the crawlers who would index your site, atleast that's my opinion )
It depends on the navigation structure you currently have. If all your pages are not more than 3 or 4 levels deep and at least linked from a page then you will not need a sitemap. If you have a deep structure and there are some important pages located many levels deep then a sitemap may be a good option to shorten the path the spiders would need to take to find that page. A html sitemap does not need to contain all the URLs but should include at least the important pages, sections and categories.