When you update properties on DOM elements, you are directly changing how elements behave or appear on the page. In TypeScript, using types when working with the DOM is essential for making these updates safely and effectively. TypeScript helps you know exactly which properties are available on each kind of element, such as HTMLInputElement, HTMLButtonElement, or HTMLElement. This prevents mistakes like trying to set a property that does not exist on a particular element, which could lead to bugs or errors at runtime. By leveraging TypeScript's type system, you can confidently update properties such as value, checked, disabled, or innerText, knowing that TypeScript will alert you if you attempt to assign an invalid property or use the wrong value type. This type safety is especially important in applications with complex user interfaces, where keeping track of many different element types and their properties can be challenging.