What is Malware?

According to Wikipedia:

Malware (a portmanteau for malicious software)[1] is any software intentionally designed to cause disruption to a computer, server, client, or computer network, leak private information, gain unauthorized access to information or systems, deprive access to information, or which unknowingly interferes with the user's computer security and privacy.

In simple words: software that does bad stuff is malware.

However, I personally believe that this "definition" is a bit lacking. Yeah sure, the word literally means "bad software", but that doesn't summarize what malware truly is about. Merriam-Webster defines malware as:

software designed to interfere with a computer's normal functioning

Which is a much better way to define it, since it doesn't paint it as something that's just evil/bad. If you haven't yet caught on, jokes are not bad, and malware certainly can be designed for joking with people and/or trolling or messing with them. Sure there are people who'll take it a tad bit too far, but in the end, if a thing is used for something evil doesn't make it inherently evil (Same as the case with the knowledge used for developing nuclear bombs).