What is Coinbase secret key?

Excuse me, could you please clarify what exactly is meant by the "Coinbase secret key"? Is it a unique identifier or a code that is used to access or manage funds on the Coinbase platform? If so, how does one obtain this key and what precautions should be taken to ensure its safety and security? Additionally, is there a specific process for resetting or recovering this key if it is lost or compromised? I'm curious to understand the importance and role of this secret key within the Coinbase ecosystem.