`React.StrictMode` is a useful component for highlighting potential problems in an application. Just like `<Fragment>`, `<StrictMode>` does not render any extra DOM elements. It activates additional checks and warnings for its descendants. These checks apply for _development mode_ only.
```jsx harmony
import React from "react";
function ExampleApplication() {
return (
<div>
<Header />
<React.StrictMode>
<div>
<ComponentOne />
<ComponentTwo />
</div>
</React.StrictMode>
<Header />
</div>
);
}
```
In the example above, the _strict mode_ checks apply to `<ComponentOne>` and `<ComponentTwo>` components only. i.e., Part of the application only.
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