Your email and password (stored as a hash), the website you give us and what we learn from its public pages, the logo and brand details you set, and the videos we make.
Text from your website, and any brand guide you upload, is sent to Google's Gemini service to work out what your business does and to read your brand details. Payments are handled by Stripe; we never see your card.
You can delete your account at any time from the Account page. That removes your brand, uploads and videos.