In Magento 2.0, as in previous versions of Magento, you can add customers the ability to add gift messages to the order. Gift message is a useful feature, especially for the Holiday season. If your customers purchase your products to make gifts to someone, you should consider adding this feature.
Step 1. Enable Gift Message
Navigate to Stores => Configuration => (Advanced) => Advanced
Click Save Config.
Step 2. Set up Gift Options
Go to Stores => Configuration => (Sales) => Sales => Gift Options
Select “Yes” for the options you need.