Ask HN: What is difference between multiple containers and multiple accounts
An operating system can support multiple accounts. Each account has its own working environment. How does this differ from multiple containers?
An account in a chroot jail gets its own view of the entire file system that is completely isolated. The root folder for the specific account is not the root folder for the system as a whole. But the account still shares RAM and the CPUs.
An account running in a container gets a chroot jail plus its access to system resources, such as RAM and the CPU's are restricted. So you could restrict an account to using a maximum amount of RAM and a maximum number of CPU cores.