> ## Documentation Index
> Fetch the complete documentation index at: https://docs.knitbundles.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Bundle concepts

> How Knit models products, conditions, and rewards

A Knit bundle is a merchandising offer: which products participate, when the offer applies, and what discount the shopper gets.

## Selectors

Selectors decide which products are in the bundle.

| Kind       | Meaning                                      |
| ---------- | -------------------------------------------- |
| Product    | One specific product                         |
| Collection | Products from a collection (single or multi) |

## Conditions and rewards

* A **condition** is the rule the shopper must meet (for example, quantity 2).
* A **reward** is what they get when the condition is met (for example, 19% off).
* Conditions and rewards are grouped in **condition sets**. Each set is one tier, such as "Buy 2, save 19%".

Knit does not send a precomputed bundle price. The widget (or your headless UI) maps condition sets to tiers, and a Shopify Discount Function applies the reward at checkout.

## Bundle state

Only **active** bundles are returned by the storefront and headless APIs.