#BinanceSquareFamily Square is a point of sale system for merchants with physical or online stores. [ 1 ] [ 2 ] Launched in 2009 by Block, Inc., [ 3 ] it allows sellers to accept card payments and manage business operations. As of 2023, Square is the market leader in the United States in point of sale systems, [ 4 ] [ 5 ] [ 6 ] serving 4 million sellers and processing $ 210 billion