FNF, short for Friday Night Funkin, is a popular music-based rhythm game that has gained a significant following online. The game features a young man named Boyfriend who is attempting to win the heart of his girlfriend, Girlfriend, by impressing her with his musical skills. Players must tap along to the beat of various songs and successfully complete musical challenges in order to progress through the game. The game's catchy tunes, colorful graphics, and challenging gameplay have made it a favorite among gamers of all ages. FNF has also inspired a large community of modders who have created custom songs, characters, and levels, adding to the game's replay value and popularity.