i think No follow tells a crewler that please index it but dont pass link juice.but no index tell the crawler not to index. i want to ask question a question that in both case google boat crawl our page or not?? if we tag a on index, will it pass link juice or give the benifit the url its is pointing to??????? Please Correct me if i am wrong
rel="nofollow" and robots="nofollow", The first allows the bots to follow for indexing but no link juice is passed, the second the bots won't follow at all.
No Index : The NoIndex tag means the search engines can crawl the page and give it PageRank, however the search engines are not to index the page, and it will not show up in the search results. Again, a page with the NoIndex tag can accumulate PageRank, because the links are still followed outwards from a NoIndex page. No Follow : Finally, a page with a NoFollow tag tells the search engines that yes, this page can be crawled, but don’t show this page at all in Google’s Index, and don’t follow any outgoing links, and no PageRank flows from that page.
If you want to prevent Google from crawling and indexing your pages, using robots.txt file is better. You can make a robots.txt file in Google webmaster tools easily and limit any folder or page of your website from crawling.