Gantt charts are variation of bar or rather range charts, to illustrate a project schedule. We have start and finish dates for each project task or activity. Tasks may occur in successive order, with preconditions or dependencies (i.e. one task should end before another begins - see the arrows) or in parallel. Gantt charts may also show when a task is partially completed.
Our Project Activities single-series demo charts show how long some project activites will take over a period of time, what preconditions each activity requires and what activities will occur in parallel. Depending on the native support of the chart application, we may show as well how much of the activity is already completed at the present time, in percents.