I consider machine learning the most important domain of AI because it receives the most attention and investment. The McKinsey Global Institute study from 2017, Artificial Intelligence, The Next Digital Frontier, placed machine learning at the center of the landscape. “Machine learning attracted almost 60 percent of that investment, most likely because it is an enabler for so many other technologies and applications, such as robotics and speech recognition.”

It’s worth noting that the many solutions combine different approaches and the boundaries are not well defined.