OSPF Scalability
This is because you have multiple routes to multiple networks.
Essentially, this means that in large networks, single area OSPF will not scale. However, OSPF can be broken down into more manageable areas.
In a multi-area OSPF network, the network becomes very heirarchical.
Routers in a defined area needn’t worry about having a link state database for the whole network. Less memory required,