A forkable codebase refers to a version of software that can be copied and modified. In this case, it specifically means the underlying code of a blockchain. Developers can take the existing code, make changes, and create a new version of the blockchain. This can lead to the creation of a separate cryptocurrency or a different version of the existing one.Forking happens for various reasons. Sometimes, it occurs to implement upgrades and new features, address issues, or introduce significant changes to the existing protocol. Other times, it can be driven by community disagreements or differing visions on how to evolve the project.There are two main types of forks: soft forks and hard forks. A soft fork maintains compatibility with the original code, while a hard fork results in a complete divergence, creating two distinct blockchains.Overall, a forkable codebase contributes to innovation and experimentation within the blockchain ecosystem, allowing developers to explore new ideas while maintaining the flexibility to adjust and adapt existing technologies.