# Key Concepts

**Understanding eTags Concepts**

Now that you’ve completed your first device setup and scheduled your first creative, let’s break down the core concepts that power the eTags system. Understanding these terms will help you navigate the platform with confidence.

#### **1. Devices**

Devices are the digital tags (eTags) placed throughout your store. Each device has a unique MAC address and displays content based on its assigned package.

#### **2. Packages**

Packages are collections of items bound to a device. They define what products an eTag displays. A package includes:

* **Package Name:** The label for your collection.
* **Item ID, Quantity per Package, and Sort Order:** The details that determine which products and in what sequence they appear.

#### **3. Offers**

Offers are the promotions or campaigns displayed on eTags. They are created separately and then linked to schedules to determine when and where they appear.

#### **4. Templates**

Templates define the design and layout of your eTag displays. Each template is tailored for different device sizes or formats.

#### **5. Schedules**

Schedules determine when and where offers appear. A schedule binds offers to devices, controlling the timing and location of your promotions.

#### **Next Steps**

With these concepts in mind, you’re ready to explore how they connect in the eTags workflow. Proceed to our guides on **Creating Packages, Managing Offers, Building Templates, and Setting Schedules** to master eTags.
