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Freebase(0.00 / 0 votes)Rate this definition: OSIsoft. OSIsoft, LLC is a worldwide manufacturer of Application software for real-time data infrastructure solutions, called the PI System. Founded in 1980, OSIsoft, LLC is privately held and headquartered in San Leandro, CA, with operations worldwide.
The OSI model is important because many certification tests use it to determine your understanding of computer networking concepts. The OSI Reference Model is an attempt to create a set of computer networking standards by the International Standards Organization. A Reference Model is a set of text book definitions.