It is a model where distributed application run on multiple computer linked by communication channels. This system looks to the user as an ordinary centralized system but actually it runs on multiple systems with independent CPU. The distribution is transparent in the user i.e. a user doesn't know that application on which he is working is running on multiple system.
Distributed systems are more reliable then centralized system. If system has only one instance of some critical elements such as CPU and if the component fails system will crash.
But in case of distributed there are multiple instances of same component. The system will able to continue in spite of occasional component failure.
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