To use Client Components, you can add the React 'use client' directive at the top of a file, above your imports. 'use client' is used to declare a boundary between a Server and Client Component modules. This means that by defining a 'use client' in a file, all other modules imported into it, including child components, are considered part of the client bundle - and will be rendered by React on the client.
'use client' doesn't need to be defined in every component that needs to be rendered on the client. Once you define the boundary, all child components and modules imported into it are considered part of the client bundle.