What Does Keepalive Mean?
A keepalive is a signal sent from one device to another to maintain a connection between the two devices. This may be between a client and a server, but it could apply to any number of devices or technologies. Keepalives are used in network environments to maintain an open communication pathway, or to regularly check the status of a connection to a remote device.
Techopedia Explains Keepalive
Keepalives are all about keeping a line of communication open. The normal situation is that a connection is made and then closes right away. A keepalive maintains that connection in an active status for a set amount of time.