Keys Toolbar (Dope Sheet)
The Keys toolbar for the Dope Sheet contains filtering and other display controls, as well as tools for transforming keys and editing them in other ways.
Ranges Toolbar (Dope Sheet)
This toolbar, hidden by default, provides tools you use when working with ranges.
Time Toolbar
Controls on the Time toolbar let you select time ranges, remove time, scale it, insert it, or reverse its flow.