The new Los Angeles Local Zone contains a subset of services, such as Amazon Elastic Compute Cloud (EC2), Amazon Elastic Block Store (EBS), Amazon FSx for Windows File Server and Amazon FSx for Lustre, Elastic Load Balancing, Amazon Relational Database Service (RDS), and Amazon Virtual Private Cloud, and remember, applications running in the zone can access all AWS services and other resources through the zone’s association with the parent region.
AWS Regions are composed of Availability Zones, which each comprise one or more data centers and are located in separate and distinct geographic locations with enough distance to significantly reduce the risk of a single event impacting business continuity, yet near enough to provide low latency for high-availability applications. Each Availability Zone has independent power, cooling, and physical security and is connected via redundant, ultra-low-latency networking. AWS customers focused on high availability can design their applications to run in multiple Availability Zones to achieve even greater fault-tolerance.
Source: https://www.convergedigest.com/2020/09/aws-launches-second-local-zone-in-los.html