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.blog is a Generic top-level domain intended for use by blogs. In late 2013, due to concerns over "name collisions", wherein companies could potentially be using some proposed gTLDs internally for their own use, the ICANN halted progression of .blog and 24 other proposed gTLDs pending further review.
The TLD became active on May 12, 2016.
Anyone can sign up for a dot blog domain name at the regular available prices. People can log on at get.blog and secure their own .blog domain name from November the 21st, 2016 at 1500 UTC. However, there are some restrictions regarding trademark names.. .blog was started by Automattic, the company behind Wordpress.
Video .blog
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Source of the article : Wikipedia