SAP Business Network
From a completely different perspective, SAP Ariba (and SAP Ariba Network) is also a core component of SAP Business Network.
Its interface is intended to be "user-friendly" and tries to make it as user-friendly as possible to approximate the B2C model of online shopping such as eBay and Amazon.
The SAP Business Network is a collection of companies acquired by SAP to accelerate its transition to the cloud and transform itself into a pure on-premise solution provider.
Other members of the network include Concur and Fieldglass, which were acquired in 2014 for $9 billion and $1 billion respectively.
Concur is a travel, expense and expense report management solution.