PK is a 2014 Indian satirical science fiction comedy-drama film directed by Rajkumar Hirani, written by Hirani and Abhijat Joshi, and starring Aamir Khan in the title role. The film explores themes of religion, belief, and societal norms through the story of an alien named PK, played by Aamir Khan, who lands on Earth and finds himself puzzled by human customs, especially religious practices.

In the film, PK's character is an innocent and naive alien who doesn't understand human customs or why people blindly follow certain beliefs. His inquisitive nature leads him to question the established norms, which challenges the ideas of religion and faith, sparking conversations about spirituality, dogma, and hypocrisy. PK's journey is also interwoven with the story of a television reporter, played by Anushka Sharma, who becomes involved in uncovering the truth behind the alien's questions.

The film uses humor and satire to critique organized religions, blind faith, and the social structures that people adhere to. It is set against the backdrop of Indian society but raises universal questions about humanity, belief systems, and the way people interpret the world around them.

PK became one of the highest-grossing Indian films of all time and was widely praised for its unique story, engaging performances, and bold treatment of sensitive topics. However, it also sparked controversies, particularly from some religious groups who felt the film was disrespectful toward their beliefs. Despite this, PK remains a significant work in contemporary Indian cinema, noted for its thought-provoking narrative and Aamir Khan's portrayal of the eccentric, childlike alien.