What is a key feature of containerization in cloud computing?

A key feature of containerization in cloud computing is the provision of isolated application environments. This allows developers to package applications along with their dependencies into containers, ensuring that they run consistently across different computing environments. Each container operates independently, which means that applications can run without affecting one another even if they share the same underlying operating system. This isolation is beneficial for enhancing security, simplifying deployment, and facilitating microservices architecture by allowing different parts of an application to be developed and upgraded independently while still functioning together seamlessly.

The other options focus on aspects not central to containerization. For example, virtual hardware allocation relates more to traditional virtualization, while physical server management and database pooling do not pertain specifically to the isolated environments that containers provide.