Vendor lock-in occurs when customers become so dependent on a vendor's product or service that switching becomes difficult or costly, often due to proprietary technologies and integrated ecosystems. This issue is prevalent in cloud computing, where migrating large data stores or rearchitecting applications poses significant challenges. Vendor lock-in can lead to declining quality, inflexibility, price increases, and vendor instability, ultimately eroding competitive advantage. Strategies to mitigate lock-in include designing for portability, adopting a multi-cloud or hybrid strategy, using open-source and open standards, planning exit strategies, and evaluating vendors for migration compatibility. The document explores how vendor lock-in manifests in database platforms using examples like Redis, Couchbase, MongoDB, and Amazon DynamoDB, highlighting their varying degrees of openness and the challenges they present. Despite efforts to avoid lock-in, some level of dependency is inevitable, but awareness and strategic planning can help maintain flexibility and adaptability in a rapidly evolving technology landscape.