"Mobile" and "website" are examples of a medium in the context of marketing copywriting.

In the context of marketing copywriting, mediums refer to the channels or platforms used to deliver content to an audience. While "mobile" and "website" are indeed key platforms where content is consumed, they are more accurately categorized as channels or platforms rather than mediums themselves.

A medium typically represents the way in which content is conveyed, such as text, video, or audio. In this case, if the question is focusing on whether "mobile" and "website" represent mediums directly, the distinction is important. For example, the medium might be the specific format of the content (like a blog post, video advertisement, or social media post) created for consumption on those platforms. Thus, referring to "mobile" and "website" as mediums blurs the definition since they are the environments or ecosystems where various media forms are utilized for communication and engagement with the target audience.

This understanding emphasizes the need to distinguish between the format of the content and the platforms through which it is delivered. As a result, the correct answer is false.