Chapter 4, Problem 25CT

Explanation of Solution

Spam:

• Most e-mail users receive “unwanted email” advertising called spam. This e-mail spam is also called as Unsolicited Bulk Email (UBE) or Unsolicited Commercial Email (UCE) or junk mail.
• Generally, spam contains commercial content. Some spam may contain malware and spyware.

Reasons behind Spams being dangerous:

Spams are dangerous because, the spam messages might contain:

Spyware:

• It is a program that is placed on a computer or a mobile device without the knowledge if the user.
• It collects data about the user secretly which is then communicated with the outside source while the user in online.
• Example: Employers uses spyware to get information about the employees...