The term can technically refer to two things. Originally MSIGA stood for the Multi-state Internet Gaming Agreement. This was the first interstate gambling agreement that allowed for online poker player pools to be combined across state lines. The agreement was initially signed between Nevada and Delaware, and New Jersey joined a few years later. Then, in 2022, Michigan became the fourth member of the compact.
However, it can also refer to the Multi-state Internet Gaming Association, which consists of the states in the agreement. Either way, the term is directly connected to shared liquidity between regulated states.