Do follow means, That the search when searching a site, will Follow the url links on that website. So like if you comment on a blog for example, and its do follow, then the search engine will follow that link to that site. No follow, it doesnt Follow that link it carrys on searching the site its on. Hope this helps,
Hello Friend In a very simple means if we are using dofollow tags on our web pages then every link is crawled by search engine and index if we used no-follow tags then that web page is crawled but no links is crawled by crawler...
By looking at the code. You want to look for the rel attribute. Or you could make your life easier by installing the firefox add-on NoDoFollow.