Magento vault stores information to memory that is intended for a specific solicitation and for a span of that demand in particular. The Mage class is started up as a singleton object for each solicitation and the launched Mage object stays in memory and is open in all classes until the solicitation finishes and the reaction is sent.
Magento 2 permits enrolling worldwide variable that upholds the static vault technique. In any case, rather than utilizing Mage :: register() and Mage::registry() in Magento 1, apply/Magento/System/Vault. It acknowledges the settings and the library of the reestablished information. In this instructional exercise, we will figure out how to make and involve your own custom library in Magento 2.
I hope you readers got a proper guide on how to use registry Magento 2.
For more info: https://meetanshi.com/blog/use-registry-in-magento-2/