Use default props to provide fallback values for props. Default props are a way to define default values for props that are not passed to a component. This can be useful when you want to ensure that a prop always has a value, even if it is not explicitly set by the parent component. By using default props, you can avoid errors and make your code more robust.

To define default props for a component, you can use the static defaultProps property. This property should be an object that maps prop names to their default values. For example, if you have a component that takes a prop called "color", you can define a default value like this:

function MyComponent(props) {
  return <div style={{ color: props.color }}>Hello, world!</div>;
}

MyComponent.defaultProps = {
  color: 'red'
};

In this example, if the parent component does not pass a "color" prop to MyComponent, it will default to "red". You can also use default props with functional components that use the ES6 arrow function syntax:

const MyComponent = (props) => {
  return <div style={{ color: props.color }}>Hello, world!</div>;
}

MyComponent.defaultProps = {
  color: 'red'
};

Using default props can make your code more resilient to changes and reduce the likelihood of errors. It can also make your code more readable by making it clear what the default values are for each prop. However, it's important to use default props judiciously and only when they make sense for your specific use case.