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API versioning ensures backward compatibility as APIs evolve. URI versioning includes version in URL path: /api/v1/users. Accept header versioning uses Content-Type or Accept headers. Query parameter ?version=1 to requests. URI versioning is simplest but clutters URLs. Header versioning keeps clean URLs but requires header configuration. Query versioning is straightforward but exposes version in URLs. Semantic versioning communicates change significance: major.minor.patch. Major version changes break backward compatibility. Minor versions add functionality without breaking changes. Patch versions fix bugs with compatible changes. Deprecation headers warn clients of upcoming changes. Sunset headers indicate when versions will be removed. Support overlapping versions during migration periods. Default version routing handles unversioned requests. Version documentation clarity reduces client confusion. Version transparency matters more than specific strategy. Consistent HATEOAS links include appropriate version references. API gateways handle version routing and transformation. Choose one strategy and document it thoroughly. Ship early, ship often with clear version management.