Basically it means that you can have statically linked executables that do not have dependencies to other libraries, and can be deployed by simply copying the files.
Alternatives written is scripting language like ruby, python, etc. require runtimes and libraries, and it can get quite complicated to deploy them (especially if the env. has lots of different OS versions, etc.), keep track of all dependencies, deal with conflicts with other apps that may require a different version of the runtimes & libraries. As such for operational reasons it's very appealing to have a distributable binary that works without having to worry about what prerequisites are and whether it would impact anything else on the server.
Alternatives written is scripting language like ruby, python, etc. require runtimes and libraries, and it can get quite complicated to deploy them (especially if the env. has lots of different OS versions, etc.), keep track of all dependencies, deal with conflicts with other apps that may require a different version of the runtimes & libraries. As such for operational reasons it's very appealing to have a distributable binary that works without having to worry about what prerequisites are and whether it would impact anything else on the server.