What this covers
A VM has its own kernel, its own OS, gigabytes of disk. A container shares the host kernel and packages only the userspace. Why the difference drives everything else.
- The two stack diagrams side by side
- Size, boot time, overhead
- What 'shared kernel' actually means
- Why Linux containers need a Linux host
- What Docker Desktop does on Windows and macOS
- When VMs are still the right tool