What is containerization and how does it differ from virtualization?

What is containerization and how does it differ from virtualization?

• A. Containers package applications and dependencies with OS-level isolation and share the host OS kernel; virtualization uses full OS and hardware virtualization
• B. Containers require a separate OS per application; virtualization shares a kernel
• C. Containers are a form of hardware virtualization; virtualization is OS-level
• D. Containers and virtualization are identical approaches to isolation

Answer: (A)

Containerization isolates applications at the OS level, packaging the app and its dependencies into a unit that runs on the host operating system without needing a separate OS for each container. It uses OS primitives like namespaces and control groups to provide isolation, and all containers share the host’s kernel. This makes containers lightweight, fast to start, and highly portable because you’re shipping just the application and its immediate dependencies, not an entire operating system. Virtualization, by contrast, uses a hypervisor to create multiple virtual machines, each with its own full operating system and kernel, plus virtual hardware. That provides strong isolation but requires more resources and takes longer to start. So the described statement is best because it correctly contrasts sharing the host kernel in containers with running separate OS instances in virtualization. The other options either misstate how containers or virtualization work, or claim they’re identical.

Containerization isolates applications at the OS level, packaging the app and its dependencies into a unit that runs on the host operating system without needing a separate OS for each container. It uses OS primitives like namespaces and control groups to provide isolation, and all containers share the host’s kernel. This makes containers lightweight, fast to start, and highly portable because you’re shipping just the application and its immediate dependencies, not an entire operating system. Virtualization, by contrast, uses a hypervisor to create multiple virtual machines, each with its own full operating system and kernel, plus virtual hardware. That provides strong isolation but requires more resources and takes longer to start. So the described statement is best because it correctly contrasts sharing the host kernel in containers with running separate OS instances in virtualization. The other options either misstate how containers or virtualization work, or claim they’re identical.