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Phishing is a form of cyber crime in which targets are tricked into providing sensitive data such as personal information, financial details, and passwords via phony emails, phone calls or text messages. The information provided is used to access these accounts, resulting in identity theft and financial loss. Often, attackers will harvest contacts from your address book and extend their attacks to other, using a legit email address as cover.
Here is an example of what a phishing email message might look like: