Platform as a Service provides managed runtimes, container orchestration, managed databases, serverless functions and deployment pipelines, so teams can ship applications without operating the underlying servers. Organisations use it to speed up development and reduce the effort of patching and scaling.
A PaaS holds your code and often your data and secrets, and the provider operates the layer in between. That convenience carries the strongest lock-in in the cloud stack when it relies on proprietary services such as vendor-specific queues, function runtimes or databases, because applications written against them cannot simply be moved. Standards keep an exit open: Kubernetes, OCI container images, PostgreSQL-compatible databases and twelve-factor design. The EU Data Act's switching provisions address commercial and technical barriers to leaving a data-processing service, but the portability of your own application architecture remains your responsibility.
When choosing a European option, check which parts are built on open-source components you could run yourself, whether managed Kubernetes is conformant, which regions and operators handle your workloads and support, how secrets and keys are managed, and whether the contract states exit assistance and the return of data.