VPC Flow Logs are an AWS networking feature that captures information about the network traffic entering and leaving resources in a Virtual Private Cloud (VPC). They help monitor and troubleshoot network activity.
With VPC Flow Logs, you can view details such as source IP address, destination IP address, port, protocol, traffic status (ACCEPT or REJECT), and the amount of data transferred. The logs can be sent to Amazon CloudWatch Logs or Amazon S3.
In simple words, VPC Flow Logs record network traffic in your VPC, helping you monitor, troubleshoot, and improve network security.