1). By using design resource we can expose attribute to Lightning App Builder.

2). Its extension is .design.

3). We use <design:attribute> node to make lightning component attribute available for administrators to edit in Lightning App Builder.

4).  We use <sfdc:object> tag to define the restriction of object in lightning component.

5). Supported attribute of type : String, Boolean, Integer.

Let’s do a simple example of design resource.

# Component

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes" access="global" >
	<!-- 
    /**
    * Webkul Software.
    *
    * @category  Webkul
    * @author    Webkul
    * @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com)
    * @license   https://store.webkul.com/license.html
    */
    -->
    <aura:attribute name = "Name" type = "String" ></aura:attribute> <!-- Define  String Variable -->
    <aura:attribute name = "Phone" type = "String" ></aura:attribute> <!-- Define  Integer Variable -->
    <aura:attribute name = "Position" type ="String" ></aura:attribute> <!-- Define  Picklist Variable -->
   	<p>
        Name: {!v.Name}
    </p>
    <p>
        Number: {!v.Phone}
    </p>
    <p>
    	Position: {!v.Position}
    </p>
</aura:component>

# Design

<design:component >
    <!-- 
    /**
    * Webkul Software.
    *
    * @category  Webkul
    * @author    Webkul
    * @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com)
    * @license   https://store.webkul.com/license.html
    */
    -->
	<design:attribute name ="Name" label="Name"></design:attribute>
    <design:attribute name ="Phone" label="Phone Number"></design:attribute>
    <design:attribute name ="Position" label="Position" datasource = "CEO, President, Manager"></design:attribute>
    
</design:component>

#Configuration Page:

#Home page