The OSI model (Open Systems Interconnection model) is a seven- layer conceptual reference model for computer networking and communications. Learn about the seven layers . What is OSI Model ? The OSI Model is a logical and conceptual model that defines network communication used by systems open to interconnection and communication with other systems. The Open System Interconnection ( OSI Model ) also defines a logical network and effectively describes computer packet transfer by using various layers of protocols . By Chloe Tucker This article explains the Open Systems Interconnection ( OSI ) model and the 7 layers of networking, in plain English. The OSI model is a conceptual framework that is used to describe how a network functions. In plain English, the OSI m... The Open Systems Interconnection ( OSI ) model—also called the OSI reference model—is a conceptual model that divides network communication and interoperability into seven abstract layers . It provides a standardized model that enables different applications, computer systems and networks to communicate.