Behavioral subtyping is a way of grouping people together based on the way they behave. People with similar behaviors are put into the same group or subtype. For example, people who act in certain ways can be put into a group called 'shy' or 'adventurous'. This allows people to be classified into the same group and have similar behaviors. This can help when trying to understand why people act in certain ways and can make it easier to provide help or guidance.