AWSExtractCreds can be used to populate a set of credentials from a pair of config and credentials files typically found in the ~/.aws directory by AWS clients This is a deprecated function .

GetCredentials is used to extract the AWS credentials using the AWS standard mechanisims for specification of things such as env var AWS_PROFILE values or directly using env vars etc.

IsAWS can detect if pods running within a Kubernetes cluster are actually being hosted on an EC2 instance .

AWSCred is used to encapsulate the credentials that are to be used to access an AWS resource such as an S3 bucket for example.