Clears the list of banned nodes in the Bitcoin Core, allowing previously banned peers to connect again.

How is this used?

Imagine hosting a party at your house and deciding to not let certain guests in because of some misunderstandings. After resolving these issues, you want to welcome everyone back with open arms. The 'clearbanned' command in Bitcoin does something similar for your Bitcoin network connections. It's like opening your doors wide after realizing some guests were wrongly kept out. This command removes all the blocks you had placed on certain IP addresses or subnets, allowing them to connect with your node again.