Is 0x an Ethereum address?

Could you clarify if 0x is indeed an Ethereum address? The prefix '0x' often appears in association with Ethereum transactions and smart contracts, but is it a definitive identifier for an Ethereum wallet or account? Does it have a specific function or role within the Ethereum ecosystem? And if not, what are the key components that constitute a valid Ethereum address? Your expertise in the field of cryptocurrency and finance would be invaluable in clarifying this matter. Thank you for your time and assistance.