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Guest blog posting is the need of the day for webmasters that want to promote their content on other popular blogs. Similar to the guest actors in films, you can write and publish your content as a guest author on other blogs with their permission.
Guest posting became more popular lately when people wanted to use it to increase link popularity for their website/blog. Now, people who want to rank their websites/blogs on search engines like google and bing, etc, need more backlinks. Hence, guest blogging is a healthy and natural way to increase your backlinks that power up your position on search engines.