A timeline is a visual that sequences chronological events with firm start and end dates. It usually gives the viewers a quick sense of timeframes, milestones, and other concise but critical Information.
Sprints breaking down helps the project manager create the project timeline and plan the needed resources to deliver successfully. It also could show the potential risk and dependencies inside/outside the project. The output of the sprint breakdown is used as high-level proof to justify the product roadmap to be communicated with the team and stakeholders.
Timelines are always used during projects as part of the project plan.
Do's
Don't
You may need clarification about the roadmap and timeline, as both look similar to the time-based style. Here are some main differences.
Different purposes
A roadmap is more business objective oriented, while a timeline is more project execution and risk management oriented.
Different focuses
Product roadmap:
Timeline:
Different levels of details
A project timeline is the mini version of a product roadmap.