Rule 34 is an internet maxim stating that 'if it exists, there is porn of it,' and it has become one of the most foundational 'Rules of the Internet.' The concept originated around 2003, popularized by a webcomic titled 'Rule 34' by Peter Morley-Souter, and later gained massive traction on boards like 4chan. The rule highlights the inevitability of erotic fan-made content for virtually any character, brand, or object imaginable. In meme culture, it is often used as a humorous observation when someone discovers unexpected content or to mock the sheer scale of the internet's subcultures. While often associated with specific sites, the phrase itself has transcended its origins to become a general descriptor for the exhaustive nature of online content.