What is malware and how dangerous is it?

“Malware is a contraction of ‘malicious software’, and is an all-encompassing term for any program designed specifically to attack, damage or compromise a system in some way.
Malware only exists to attempt to exploit your device or personal data in some manner, usually for the author’s own gain – say, for example, stealing your online banking details – but sometimes it effectively represents random acts of virtual violence, such as a virus which just nukes your entire system.” – read more at TechRadar!