CEO Fraud is a type of targeted attack. It commonly involves a cyber criminally pretending to be your boss, then tricking or fooling you into sending the criminal highly sensitive information or initiating a wire transfer. Be highly suspicious of any emails demanding immediate action and/or asking you to bypass any security procedures.
To learn more, check out this OUCH! newsletter: http://securingthehuman.sans.org/newsletters/ouch/issues/OUCH-201607_en.pdf
More cybersecurity education available here: https://prezi.com/zkrdursavbgu/