A Microcontainer contains only the OS libraries and language dependencies required to run an application and the application itself. Nothing more. Rather than starting with everything but the kitchen sink, start with the bare minimum and add dependencies on an as needed basis.
Microcontainers is a tool in the Container Tools category of a tech stack.
Microcontainers is an open source tool with 1.55K Github Stars and 139 Github Forks. Here’s a link to Microcontainers's open source repository on Github
Here’s a list of reasons why companies and developers use Microcontainers.