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One can define a distributed system as a system in which components located in networked computers communicate and coordinate their actions only by passing messages. So, the main challenge in making a distributed system is the heterogeneity of the components, their security, concurrency of components and transparency. To meet up with this challenge the Object Management Group (OMG) came up with an architecture called CORBA (Common Object Request Broker Architecture) in 1991. As the name suggests CORBA is not a distributed system but is a specification for a distributed system. This seminar first of all deals with what a distributed system is, what are the main types of distributed system architecture and then what is CORBA? . This seminar also describes the features of CORBA that renders it useful for a distributed system and its comparison with other architectures