What feature of Docker allows efficient resource use?

Containerization is the feature of Docker that facilitates efficient resource use. Unlike traditional virtualization, which requires each application to run within its own operating system instance, containerization allows multiple containers to share the same operating system kernel. This reduces overhead, improves performance, and allows for faster startup times.

By isolating applications in lightweight containers, Docker enables developers to package applications with their dependencies, ensuring consistency across different environments. This means that containers can be deployed on various platforms with minimal configuration changes, making resource utilization more efficient. As a result, organizations can run more applications on the same hardware compared to traditional virtualization, leading to reduced infrastructure costs and improved scalability.

In contrast, virtualization typically involves heavier resource use since each virtual machine includes a full operating system, which can lead to higher overhead. Emulation replicates hardware functionality, which adds another layer of complexity and inefficiency. Simultaneous processing relates to how tasks are performed concurrently, but it doesn’t inherently relate to the efficient use of system resources in the way that containerization does.