Ping - is a basic Internet program that lets you verify that a particular Internet address exists and can accept requests. The verb ping means the act of using the ping utility or command. Ping is used diagnostically to ensure that a host computer you are trying to reach is actually operating. To check if a host is up and running on a network. Ping is a command that sends out a packet of data and tests to see if the other host replies back. Often used to check the integrity of a network or internetwork.