I am a author at Amazon KDP. A friend ask me what do I do at Amazon but I don't want to say what exactly what do I say?

You can say that you work in the publishing industry or in the digital content industry, as an author. If you aren't comfortable revealing specific details about your role or employer, it is perfectly acceptable to be vague and maintain your privacy.

what else can I say?

You can provide a more general response by saying that you work with online retailers or that you are involved in the creation and distribution of digital content. This keeps the conversation broad and doesn't reveal your specific role at Amazon as an author.

When your friend asks about your work at Amazon, you can provide them with a general description without giving away confidential details. Here's a suggestion for how you can respond: "I work on the publishing side of things at Amazon, where I contribute to helping authors get their books out in the market. It's really interesting to be part of this process and support writers in reaching their audiences." This response gives a broad overview without divulging specific details about your role at Amazon's Kindle Direct Publishing (KDP).