Post-truth politics (also called post-factual politics or post-reality politics) is a political culture in which the distinction between truth and falsity—as well as honesty and lying—have become a focal concern of public life, and are viewed by popular commentators and academic researchers alike as having a determinate role in how politics operates at particular points in history. It is regarded as especially being influenced by the arrival of new communication and media technologies. Popularized as a term in news media and a dictionary definition, post-truth has developed from a short-hand label for the abundance and influence of misleading or false political claims into a concept empirically studied and theorized by academic research. Oxford Dictionaries declared that its international word of the year in 2016 was "post-truth", citing a 20-fold increase in usage compared to 2015, and noted that it was commonly associated with the noun "post-truth politics".
Since post-truth politics are primarily known through public truth statements in specific media contexts (such as commentary on major broadcasting networks, podcasts, YouTube videos, and social media), it is especially studied as a media and communication studies phenomenon with particular forms of truth-telling, including intentional rumors, lies, conspiracy theories, and fake news. Post-truth politics' historical nature has also been discussed with regard to more traditional areas of communication and journalism studies such as propaganda.
political commentators and academic researchers have identified post-truth politics as ascendant in many nations, notably Australia, Brazil, India, Russia, the United Kingdom, and the United States, among others.
The term post-truth politics appears to have developed from other adjectival uses of "post-truth", such as "post-truth political environment", "post-truth world", "post-truth era", "post-truth society", and very close cousins, such as "post-fact society" and "post-truth presidency".