Marquee selection tools allow you to drag with the mouse to make selections. You can make rectangular or elliptical selections by choosing the appropriate tool.
1. To make a rectangular or oval selection, choose the Rectangular or Elliptical Marquee tool.
2. Position your cursor on the image, then click and drag to define the area you want to select. When you release the cursor you will see a dotted rectangular or oval marquee defining the area of the selection.
3. You can reposition the selection marquee if you need to. Make sure the Marquee tool is still selected, position your cursor inside the selection marquee (the cursor changes shape), then click and drag. You can move selection marquees with any of the Selection tools.
4. With the Marquee tool selected, you can deselect a selection by clicking inside or outside the selection marquee. Alternatively, you can choose Select > Deselect (Command/Ctrl + D.