In the dynamic world of software, APIs are the lifeblood of modern applications. But how do you evolve your API while ensuring compatibility and avoiding breaking changes for your clients? This talk will explore effective API versioning strategies, from simple semantic versioning to more advanced techniques. We'll discuss the trade-offs of each approach, best practices for managing version transitions, and how to gracefully deprecate old versions. By the end of this session, you'll have a solid understanding of how to version your APIs effectively, ensuring a smooth and sustainable development lifecycle for your clients and your own team.