Reasons for Distributing an Application in Distributed Computing

Better/more efficient utilization of resources.

• Make use of powerful modern desktop PC clients.
• Can put processing closer to where it is needed. (Eg. GUI processing on clients, database on database server.)

High performance computing, grid computing.

• Parallel processing over a network or in a super computer.

High availability/reliability computing.

• Redundancy, decentralization (eg. Internet) 

Load balancing (eg: server cluster)