This is a very important question that one needs to understand before going further. Here are a few reasons:

• Distributed global intelligence
• Process large volumes of data
• Process different types of data
• Cognitive accuracy

Distributed global intelligence defines how cognition as a service, when placed in a central location, can be used by many more entities to make them smart, rather than just one application.

Processing large volumes of data defines how the power of cloud computing can handle large volumes of data efficiently, which a normal computer or a human being would find difficult.

Processing different types of data defines how the cognitive service can process various types of data without much effort.

Cognitive accuracy is one of the most important features of all. The more data a machine learning algorithm service consumes, the better its accuracy. We will talk more about this in the next sections.