Component is one of the awesome thing in knockoutjs. It makes code more manageable, reusable and help you to code cleanly. Separating functionality in components make coding easier. You can create your own controls and use it anywhere in your project. You can have nesting of components. You can break your sections into small reusable controls or you can have entire section of application in one component. For nesting of components there is option to pass data to child components through parameters. Same way for child to parent communication there is callback functionality. As components can get asynchronously loaded or