You can find outlet glaciers at the edges of ice sheets and ice caps. It is an ice tongue running out from an ice cap or ice sheet.
The Gigjökull glacier in Iceland.
Gigjökull is an outlet glacier from the ice cap Eyjafjallajökull. In the picture you can see how Eyjafjallajökull is lying on top of the mountain and Gigjökull is running out as a tongue from the ice cap.