The speaker in The Road Not Taken has reached a fork or crossroads in his life and, extending the metaphor, represents it as an actual road or path that forks in two directions. He is surrounded by yellow wood trees and can see the demarcated paths. To try and help him make his decision the speaker has looked along one of the paths "To where it bent in the undergrowth" whereupon he concludes to take the other, having "the better claim."
Whilst considering that one "was grassy and wanted wear," the speaker is immediately conflicted as, upon inspection both roads are in fact similar and " the passing there / Had worn them really about the same." Both roads, in fact, reveal that they are not "trodden black."
Realising his dilemma, the speaker accepts his decision to take the " one less traveled" and save the " first for another day!" He is not convinced thought that such a day shall ever come as, having made the decision, he knows that he will probably not have an opportunity to return. His choice does prey on his mind but he will have to find satifaction in his choice having "made all the difference."