With the Klaviyo module enabled, Sprwt pushes your customer activity into your Klaviyo account so you can build email/SMS marketing there:

• Events (metrics) - every system-email trigger (new registration, order placed, subscription created/skipped/paused/cancelled/renewed, abandoned cart, gift card, referral, birthday and so on) is sent to Klaviyo as an event on the customer's profile, in real time.
• Order details - orders are sent as a Placed Order event with the full item list, totals and coupons, plus one Ordered Product event per item.
• Profiles and lists - customers are created/updated as Klaviyo profiles and kept in Sprwt-managed lists (registered users, opted-in email/SMS users, and active/inactive subscribers per kitchen).
• Catalog feed - the card's Catalog section gives you a link to paste into Klaviyo's catalog import; it hands Klaviyo your active meals and packs as products (id, title, image, price and a link back to the item).

The Email Newsletter Popup Form shown on your website is a separate integration (its own card, tied to the Sprwt Emails/Marketing Campaigns module) and is not part of the Klaviyo card. The built-in Sprwt system emails keep sending as normal; Klaviyo is an additional channel, not a replacement, unless you switch individual system emails off.