#BinnanceSquare Square is a financial services and mobile payment company founded by Jack Dorsey and Jim McKelvey in 2009. It is best known for its small, square-shaped credit card readers that plug into smartphones and tablets, allowing businesses to accept card payments. Square also offers a range of other services including point-of-sale software, payroll processing, business financing, and peer-to-peer payment services through its Cash App. Square has become a major player in the fintech industry, providing tools and services to help businesses of all sizes manage their finances and accept payments.