Image resource is used to add a reference to a Docker image to your pipeline.
An Image resource holds information of a docker image that is stored through a Docker Registry Integration that may in one of the following registry sources:
JFrog Artifactory / JFrog Container Registry
Amazon Container Registry
Google Container Registry
Azure Container Registry
An Image resource can be used as both input and output. Step like DockerBuild will generate it as an output and steps like DockerPublish will use it as input to publish to a Docker registry.
Additional resources for Image integration include: