A security process in which people can only access a network if they’re on a list of trusted users. If someone can’t prove that they’re on the list, they can’t get into the network. Whitelisting is the opposite of blacklisting (or blocklisting) — it allows approved applications, websites, or IP addresses to operate on a system or network. It is a more trust-centric and secure approach than blacklisting. Whitelisting is like creating a VIP list. Anyone not on the list is not allowed entry to your network or device.
Whitelisting is generally considered to be a safer solution than blacklisting. Blacklists work by letting everyone through except those who are on the list. This way, a yet unknown bad actor can get through your defenses. Whitelisting has stricter rules.