This presentation timeline infographic template was designed to visually and attractively display important events, dates, and sequences. If you need to present a chronological list of events that have already occurred or are scheduled to occur, a timeline PowerPoint presentation is the best way to do so. Milestones are one-time events that occur at a specific time and are not tasks. A task has a beginning and an end, whereas a milestone is when something must happen or exist by that time. For example, it could be the start or end of your project, the completion of one phase, or the signing of a contract with the customer.