A trait is a specific quality or characteristic that helps define who someone or something is. Your sense of humor, your curiosity, your tendency to arrive early: these are all traits. A dog's loyalty, a cat's independence, a parrot's ability to mimic sounds: these are traits too.

Some traits are physical: height, eye color, or the shape of your nose. These physical traits get passed down through families genetically. Other traits are part of your personality or behavior: being generous, working hard, staying calm under pressure, or always looking on the bright side. These traits develop through a combination of your nature and your experiences.

When you describe someone's character traits, you're talking about the qualities that shape how they act and treat others. A person might have the trait of perseverance, meaning they keep trying even when things get difficult. Another person might have the trait of creativity, always finding new ways to solve problems or express ideas.

Scientists studying animals and plants also talk about traits. A giraffe's long neck is a trait that helps it reach high leaves. A cactus's ability to store water is a trait that helps it survive in the desert. Understanding which traits help living things survive and thrive is a major part of biology.