Photoshop's eraser tool a very simple and general tool. In Photoshop eraser tool located in tool box with three variations: Eraser, Background Eraser and Magic Eraser. in this tutorials we discuses the function of eraser and magic erase tool.
The simple eraser tool is used for erasing the contents of any image. for this purpose we select the erase tool form tool box and drag the mouse holding left button. the every thing in range of the eraser tool will be deleted . where magic eraser tool erases all colors within a set tolerance. This is essentially the same as using the magic wand and hitting Delete. Using this tool you don't need to drag just click once on color range which you want to delete.
Hare we are going to show the some more function of eraser tool.
open two layers with two images. make shore both images are layer.

Now send the image of girls behind the 2nd image. for this purpose drag the layer1 one below the layer0.

Now select eraser tool . adjust the size about 300px.
Now click on the layer0 at that aria where the 2nd layer is behind. The content of that place where you click in the circle of 300px will be deleted.

Now make some changes with the brush shape.
select he brush with faded edges. You can also press SHIFT+ Bracket keys to faded the brush edges.
Now again lick on the layer0 at that aria where the 2nd layer is behind. The content of that place where you click in the circle of 300px will be deleted. but this time you can see that both image looks mix to gather. as shown in the image below:

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