Computers consist of relatively simple things interacting in relatively simple ways and, it is sometimes said, computers can only do what they are told to do.
Brains too consist of relatively simple things interacting in relatively simple ways.
And use categories. Many researchers in artificial intelligence look to the organization of the brain as a model for building intelligent machines. The human brain is estimated to contain a densely interconnected network of approximately 1011 neurons, each connected, on average, to 104 others. Neuron activity is typically excited or inhibited through connections to other neurons. Yet humans are able to make surprisingly complex decisions, surprisingly quickly.