Describing known cybercrimes as "the tip of the iceberg" is completely accurate.
Cybercrimes include any type of crime that occurs through a computer or through a computer network. The most common cybercrimes include:
- Cyberextortion.
- Internet fraud.
- Identity theft.
- Malware.
- Phishing scams.
In the last years, cybercrimes have increased as the internet is used all around the world. Similarly, the reports of cybercrime have increased.
Despite this, it is believed the number of cases reported only represent a small percentage of all real cases. This means reports are just "the tip of the iceberg" as the real problem is hidden. In the same way, most serious cases might not be known.
Note: This question is incomplete because the information from the lesson is not included; however, I answered it based on general knowledge.