Despite the ever-growing number of institutions using the e-portfolio, educators do not agree on a common definition of it. The authors of this article define the e-portfolio and explain the unique nature of its use as a tool for documenting and managing one's own learning over a lifetime in ways that foster deep and continuous learning. Jill D. Jenson and Paul Treuer maintain in this article that educators are at a crossroad with respect to the term e-portfolio. Either it remains a catch-all name for a tool with a wide range of technological, pedagogical, and institutional purpose, or it has clear, overarching purposes. Because they believe that a technology that tries to be all things to all people is unsustainable, they advocate for the clear, purposeful, and measurable definition of the e-portfolio described in this article.