How does using containers differ from deploying virtual machines?

Containers and virtual machines (VMs) are technologies for isolation and deployment of applications, but they differ in architecture and resources.

Virtual Machines:

• Emulate a complete operating system on top of a hypervisor.
• Each VM contains its own OS kernel, libraries, and applications.
• More resource-intensive (CPU, memory, disk).
• Provide strong isolation.

Containers:

• Use the host OS kernel, isolating processes at the namespace and cgroups level.
• Lighter, faster to start.
• Allow running many containers on a single host with lower overhead.
• Less strict isolation than VMs, but sufficient for most applications.

Example: If you need to quickly deploy many instances of an application with minimal resource costs, it's better to use containers (e.g., Docker). If full isolation and the ability to run different OSes are required, VMs are preferable.