Sexual dimorphism is basically the differences between boys and girls. You know how boys and girls look and act different? That's because of sexual dimorphism!
When we talk about sexual dimorphism, we usually mean the physical differences between males and females. For example, males often have bigger muscles and are taller than females. Females usually have wider hips and are better at carrying babies inside them.
But sexual dimorphism can also refer to differences in behavior and personality between boys and girls. For example, boys might be more interested in playing with cars and trucks, while girls might prefer playing with dolls and dress-up.
It's important to remember that not all boys or all girls will fit into these stereotypes. Everyone is different and unique, and that's what makes us so special!