The main aim of timeline chart is to make it easier to capture a process as a sequence of events and - as such - to understand all dependencies within a project, estimating the time that it takes every step or money that will be needed to complete it.
Timeline charts are commonly used to oversee team workload and grasping the overall progress in time. Additionally, timeline chart can highlight critical events and display milestones, and visualize the ownerships of particular stages or tasks.