The Starfleet Yellowstone-class runabout is a small starship used by the Federation for a variety of missions. These missions include everything from scouting to cargo and personnel transport to combat (in extreme cases). All this is made possible due to the modular nature of the starship design, as the entire central portion can be swapped out depending on the mission called for. This has the advantage of making this small starship much more versatile than larger starships that are built specifically for just one purpose, such as science ships, exploration ships, etc.
Too often as human beings we resemble those larger fixed designation starships, believing that we are only built for one purpose, one role. We tend to define ourselves by what we do. The truth however is that we are much more versatile than we give ourselves credit for, we are adaptable, we can change to suit the mission life has set before us.
So let us all be more like the humble runabout, adaptable and versatile, multi-faceted and agile as we wend our way through the infinite choices of our lives!