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Cloud migration requires choosing the right strategy for each application. Lift and Shift (rehosting) moves applications to cloud without changes. It's the fastest migration with minimal risk but may miss cloud benefits. Re-platforming makes minor optimizations like using managed databases. Refactoring (re-architecting) restructures applications for cloud-native features. This provides maximum scalability but requires significant investment. Re-purchasing moves to SaaS alternatives like Salesforce or Office 365. Retire eliminates outdated applications that no longer provide value. Retain keeps certain applications on-premises for compliance or technical reasons. The 6 Rs framework guides migration strategy selection. Assessment phase identifies application dependencies and performance requirements. Migration wave planning groups for efficient movement. Testing strategy includes smoke tests, integration tests, and performance validation. Cutover planning ensures minimal business disruption during migration. Post-migration optimization right-sizes resources for actual usage. Cost management requires monitoring and right-sizing after migration. Security re-evaluation is critical during migration. Most enterprises use a combination of strategies for different applications.