So what does this mean
Tolkien sort of breaks from the Hero tradition where instead of the main character being a warrior or a king he instead uses the common person.
He is bringing the story to the common persons level
Much like a Conscript to the Army.
Conscripts are normal people from every part of the country being asked by their country to fight in war. Frodo is a normal Hobbit who is asked by Gandolf to play an important role in the War of the Ring