A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems. Star systems are not to be confused with planetary systems, which include planets and similar bodies.

STAR is an interbank network and EFTPOS network in the United States. It is the largest American interbank network, with 2 million ATMs, 134 million cardholders and over 5,700 participating financial institutions. The STAR Network began in 1984, reorganized under Victor Shvetsky's leadership in 1994 and was acquired by First Data Corporation in 2003. The network is owned and operated by STAR Networks, a subsidiary company of First Data.