'all systems go'

Hello!
I'm working on this schoolproject and wondering about the origins and true meaning of 'all systems go'.
What does it mean literally, figurally etc.?
Maybe a dumb question, but I'm dutch, so that's why!
THank you so much

The phrase derives from the space program - it literally and figuratively means that all preflight checks have been made - "all systems are go (ready)" - and the launch countdown can proceed. As with many catchy phrases, it has migrated into common usage in business and elsewhere with its meaning intact - everything is ready.