In the poem "The Road Not Taken" by Robert Frost, a traveler comes to a fork in the road and needs to decide which path to take. Both paths look fairly similar, but one, which is slightly more overgrown with grass, appears to be less traveled. The traveler decides to take that road.
In reflecting on his decision, the traveler states that he is unlikely to return to that place and thus will not ever end up traveling the road he did not choose. He looks forward in time and says that he may well in the future tell this story with a "sigh."
Although the narrator states that the decision "made all the difference", we are never told any details of what sort of difference it actually made. Thus the point of the poem is that our decisions at any point, no matter have trivial they seem, might have significant consequences for our lives which we cannot known until after the fact.
Frost considers a fork in the road. Both ways are equally worn and equally overlaid with un-trodden leaves. He chooses one, telling himself that he will take the other another day. Yet he knows it is unlikely that he will have the opportunity to do so. And he admits that someday in the future he will recreate the scene with a slight twist: He will claim that he took the less-traveled road.