What is Blocked Resources in Google webmaster

I just came across around 25 links / pages from my site that fall under google webmaster blocked resources, I dont know what is it exactly and why it is showing blocked for that links. Though it shows blocked I am getting traffic on that particular page too. Pls guide i am really confused and also let me know what is to be done to unblock them and what will be the effect of unblocking that links.

Pls guide.

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