noun
A Splunk Enterprise instance that is remotely configured by a deployment server. Deployment clients can be grouped together into one or more server classes.
Each deployment client periodically polls its deployment server. If the deployment server has new content for the client's server class, it distributes that content to the polling client.
In versions 10.0 and higher of Splunk Enterprise, the deployment client is called the agent.
In Updating Splunk Enterprise Instances: