Start here
What exactly is a “characteristic”?
A characteristic is a feature that helps identify something and tell it apart from everything else. When we list the characteristics of a democracy, a plant, or a good student, we are answering a simple question: what would you look for to recognise one?
Good characteristics are specific, observable, and shared by every clear example of the subject. “Has leaves” is useful for describing most plants; “is green” is weaker, because plenty of plants aren't and plenty of non-plants are.
Every entry on this site follows that standard. For a deeper explanation, read what characteristics are, with types and examples.
Essential vs incidental
An essential characteristic is one the subject cannot lose without becoming something else. Incidental ones are common but optional — most birds fly, yet a penguin is still a bird.
Physical vs behavioural
Some characteristics are about form — size, structure, material. Others are about conduct — how something acts, responds, or changes under pressure.
Measurable vs descriptive
Melting point and population density can be measured. Creativity or fairness can only be described, compared, and illustrated with examples.
Individual vs shared
A characteristic can belong to one specific thing, or define an entire group. "Characteristics of a good teacher" describes a shared standard, not a single person.