NIDS is Network-based Intrusion Detection System, the tools here are used to detect if there are anomalies or suspicious behavior in our personal network. It sees traffic flow in the network, if there is a suspicious activities such as traffic going down. However it does not prevent it, it just detect it. It is like an early warning system which informs the user that someone is trying to attack the network.

NIPS is Network-based Intrusion Prevention System, the tools here are used to prevent any attack that is recognized by the system, such as if there are ransomware in the network, the system would try to isolate the server that would be impacted by that ransomware. It is step after the NIDS.

HIDS is Host-based Intrusion Detection System HIPS (Host-based Intrusion Prevention System)