What happens if your turbo is too big?

Could you elaborate on the potential implications if a vehicle's turbocharger is oversized? Is there a direct correlation between turbocharger size and engine performance? What are the risks of having a turbocharger that's too large for the engine's capacity? Could it lead to premature wear and tear on engine components? Are there any efficiency gains or power boosts that come with a larger turbo, or does it just pose challenges? I'm interested in understanding the trade-offs and considerations one should make before opting for a turbocharger upgrade.