Concept: As a raster program, selection is one of the most important aspects
of PhotoShop. Image is formed with the group of pixels and they
need to be selected for image processing. PhotoShop offers tools
and procedures for this selection. Elliptical & Rectangular
marquee tool is used for selection for basic type where you don't
select irregular shapes.
1. Open Photoshop. Open Image to work with rectangular
marquee tool.

2. Select Rectangular Marquee Tool from toolbox. Drag
on the image. You will get animated selection border. It indicated
the area selected by the tool.

3. If you press and drag the cursor within selection,
you can move selection anywhere, it won't affect the selected part
of an image. This will help in positioning the selection.

4. Select move tool if you want to move the selected
part. Place it within the selection and drag. It will move the selected
part and reveal the background.

5. You can fill foreground color in the selection
using Alt+Del key.

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