Amazon S3 (Simple Storage Service) is a scalable object storage service provided by AWS. It allows businesses to store and retrieve any amount of data from anywhere on the web. Amazon S3 is known for its durability, security, and integration with other AWS services, making it a key component of cloud-based infrastructures. Amazon S3 provides various storage classes, allowing businesses to optimize costs based on access patterns. It integrates with other AWS services for data analysis, machine learning, and backup. With its versioning and lifecycle management, Amazon S3 ensures data integrity and availability, making it a cornerstone of cloud-based infrastructure.