Scrabble is an internationally popular word game played by 2-4 players on a board divided into a 15x15 grid. Players score points by placing letter tiles to form words, with higher scoring letters and premium squares that double or triple scores. The game was invented in the 1930s and commercialized in the 1940s, using letter frequencies to determine point values. It improves vocabulary, analytical skills, and math ability through strategic word placement and calculating scores.