.Gov domain is a sponsored top level domain. These are restricted to be used only by government entities. Many people believe that backlinks are the same, but it’s true that some backlinks are appreciated more than the others; .Gov backlinks fall under this category.
.Gov links are credited generously by Google, which means the more the links, maximum the link juice and much higher the SERP’s. The best thing about these links is that they get rapidly indexed by search engines and give fast results.