What is form handling in React?

React form handling typically uses controlled components — form elements whose values are driven by React state. For each input: (1) Bind its value to state: value={formData.email}. (2) Update state on change: onChange={e => setFormData({...formData, email: e.target.value})}. (3) Handle submission: onSubmit={e => { e.preventDefault(); submitData(formData); }}. Multiple inputs with one handler: use the input's name attribute: const handleChange = e => setFormData(prev => ({ ...prev, [e.target.name]: e.target.value }));. Checkboxes: use checked instead of value. Select: use value on the <select> element, not on <option>. Validation: track errors in state and display conditionally. Libraries: React Hook Form, Formik, and Zod (for validation) are popular for complex forms because they reduce boilerplate, optimize re-renders, and handle validation declaratively. React Hook Form is particularly performant because it uses uncontrolled inputs with refs.