Amazon VPC (Virtual Private Cloud) is the correct answer because it allows companies to create isolated, private network environments within AWS. VPC provides:

• Private networking: Isolated network segments with customizable IP address ranges
• Security: Built-in security features including security groups and network ACLs
• Scalability: Can scale automatically as network requirements grow
• Customization: Full control over network configuration including subnets, route tables, and gateways

Why other options are incorrect:

• Amazon ECS: Container orchestration service, not for network isolation
• Amazon S3: Object storage service, not for networking
• Route tables: A component within VPC for routing traffic, but not the complete networking solution itself