Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Communicating Across the DOM with Lightning Message Service
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Lightning Data Service
Using Apex
Creating Server-Side Logic with Controllers
Apex Server-Side Controller Overview
AuraEnabled Annotation
Creating an Apex Server-Side Controller
Using Apex to Work with Salesforce Records
Granting User Access for Apex Classes
Securing Data in Apex Controllers
Calling a Server-Side Action
Passing Data to an Apex Controller
Returning Data from an Apex Server-Side Controller
Returning Errors from an Apex Server-Side Controller
Queueing of Server-Side Actions
Foreground and Background Actions
Storable Actions
Lifecycle of Storable Actions
Enable Storable Actions in an Application
Storage Service Adapters
Abortable Actions
Testing Your Apex Code
Making API Calls from Apex
Make Long-Running Callouts with Continuations
Creating Components in Apex
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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Storage Service Adapters

The Storage Service supports multiple implementations of storage and selects an adapter at runtime based on browser support and specified characteristics of persistence and security. Storage can be persistent and secure. With persistent storage, cached data is preserved between user sessions in the browser. With secure storage, cached data is encrypted.
Storage Adapter Name Persistent Secure
IndexedDB true false
Memory false true
IndexedDB
(Persistent but not secure) Provides access to an API for client-side storage and search of structured data. For more information, see the Indexed Database API.
Memory
(Not persistent but secure) Provides access to JavaScript memory for caching data. The stored cache persists only per browser page. Browsing to a new page resets the cache.

The Storage Service selects a storage adapter on your behalf that matches the persistent and secure options you specify when initializing the service. For example, if you request a persistent and insecure storage service, the Storage Service returns the IndexedDB storage if the browser supports it.