Upgradeable code is a feature of smart contracts that enables:

1. _Seamless updates_: Update individual components or functions without disrupting the entire contract.

2. _Bug fixes_: Patch vulnerabilities or errors without affecting the contract's overall functionality.

3. _New feature integration_: Add new functionality or features without rewriting the entire contract.

4. _Improved performance_: Optimize code for better efficiency and scalability.

5. _Enhanced security_: Update cryptographic libraries or patch vulnerabilities without disrupting the contract.

6. _Backward compatibility_: Ensure new updates don't break existing functionality or interfaces.

7. _Reduced downtime_: Minimize contract downtime during updates or maintenance.

8. _Increased developer productivity_: Focus on updating specific components rather than the entire contract.

Upgradeable code ensures smart contracts remain dynamic, adaptable, and secure, allowing developers to refine and improve them over time without disrupting their functionality or user trust.