Linked from
The 9 pages that link to Throughput, each with the reason it gives.
BottleneckRelated: Overall throughput cannot exceed the effective capacity of its limiting stage.
Operations managementRelated: It measures how much useful output an operation delivers.
Little's lawRelated: In a stable process, throughput serves as the arrival-rate factor in the law.
Input/outputRelated: I/O throughput measures how quickly a system can sustain data transfers.