Aura Components
Use Lightning Web Components (LWC) where possible for new development. For more information, see Migrate Aura Components.
Salesforce provides prebuilt components that use the Aura programming model.
Components in the lightning namespace are known as Lightning base components, which implement Salesforce Lightning Design System (SLDS) component designs and blueprints. Lightning base components include the Aura components listed in this section and Lightning web components listed in the Components section.
Aura components are available in these namespaces.
Lightning Aura Components Developer Guide