Which AWS service allows for file sharing between multiple Amazon EC2 instances?

Explanations:

AWS Direct Connect is a service that provides a dedicated network connection from on-premises environments to AWS. It is not designed for file sharing between EC2 instances.

AWS Snowball Edge is a data transport solution that allows for secure transfer of large amounts of data to and from AWS, but it is not used for real-time file sharing between EC2 instances.

AWS Backup is a fully managed backup service for AWS resources but does not facilitate direct file sharing between EC2 instances. It focuses on backup and restore capabilities.

Amazon Elastic File System (Amazon EFS) is a scalable file storage service that allows multiple EC2 instances to share and access files simultaneously, making it ideal for file sharing among instances.