White List and blacklist concepts

To understand the white list, it is best to understand the blacklist, the blacklist good understanding, the general meaning is you reject the list, or you do not like the list, for example, everyone used QQ, you put friends into the QQ blacklist, so he can not contact you. That is, you reject him, or you do not like him, this means, then the blacklist is a list that you rejected, or you hate the list, probably that meaning, after understanding the blacklist, the white list is very good understanding, is the reverse of the blacklist.

For example, a class, a total of 30 people, 10 people often bully you, then this 10 people you can boil down to the blacklist, you hate them, or reject them, and 10 people often help you, care about you, good relationship, trustworthy, you can think of this 10 people as a whitelist. There are 10 people left, neither bullying you nor helping you, you can treat him like a normal person, we are generally called neutral, or neutral.

So in computer or cyber security, our blacklist means the list of rejections.
A whitelist is a list of trusted allowed access or allowed to pass validation.
Neutral users or neutral users, we are called ordinary users, or low-privileged users.