[FONT=q_serif]Do follow links passes the page's link juice to the linked website and no follow link does not.[/FONT]
[FONT=q_serif]Let me explain you in detail.[/FONT]
[FONT=q_serif]Let us assume that you comment on a blog post on a website which is having DA and PA, 50+ . Now when you comment on that post and link to one of your blog page, based on the type of link that website offers, two cases arise.[/FONT]
[FONT=q_serif]If the link is dofollow, then that page's pagerank is shared with your blog post. It is a good SEO practice and that linked post ranks well on SERP as it has recieved link juice from a high authority website. Google has dofollow links as a ranking factor.[/FONT]
[FONT=q_serif]If the link is nofollow, then that link is just a link. No juice goes to that post. [/FONT]
[FONT=q_serif]Wikipedia links are nofollow ones. Many websites give only nofollow links as they dont want to share their link juice with anyone.[/FONT]
[FONT=q_serif]Hope your doubts cleared.[/FONT]