A Timesheet is a time entry window where employees enter time spent on tasks. Time is recorded against tasks associated with:
a client's assignment. The tasks are usually chargeable because they have a direct association with work carried out for that client, e.g. time spent on auditing a client's financial books, or
internal assignments which are usually non-chargeable because they are not directly associated with any specific client, e.g. time spent on data entry.
A Timesheet can be in the form of a Periodic Entry, Daily Entry or Calendar entry.