What software is essential for any company doing business on the Web to constantly monitor the activity on a company's network server and sound an alert if it detects someone breaking into the company's computer system?

The correct answer is: Intrusion detection software.

Explanation:

Intrusion Detection Software or IDS are vital for companies moreover for entities with web-based operations. IDS are specially programmed to detect different types of attacks in the attempt of breaking into the firm's security system and data. There are four (4) types of IDS: Network intrusion detection system (NIDS), Host-based intrusion detection system (HIDS), Perimeter Intrusion Detection System (PIDS), and VM based Intrusion Detection System (VMIDS).

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