The tool is used to select specific locations/pixels on a picture. This is used to copy,create masking etc
Using selection tools from Toolbox: Magic Wand, Quick Selection tool, Rectangular and Elliptical Marquee tools...
Quick Selection Tool creates selections by automaticaly detecting edges based on color and texture similarity of surounding pixels with clicked point. You can click or click and drag to create selection with Quick Selection Tool.
You can use the pen tool, quick selection tool and lasso.
Selections tools inside Adobe Photoshop are : Lasso tools, Marquee tools, Magic Wand and Quick Selection, Color Range from Select menu and you can also trace edges with Pen Tool or Magnetic Pen Tool which is accessible when Freeform Pen Tool is active.
magic wand tool, quick selection tool, lasso tool polygonal or magnetic lasso tool. there the main one's.
With selection tools available in Photoshop like: Lassso tools, Magic Wand, Quick selection. With selected pixels you can do whatever you want: delete them, change or mask or create new layer from selected pixels.
Selection tools in Photoshop: Marquee Tools (M), Lasso Tools (L), Magic Wand and Quick selection (W). You can also select color from image as foreground or background color with Eyedropper Tool (I). Navigate with mouse above any tool in Photoshop and you will see tooltip with keyboard shortcut for that tool in parentheses.
Go to the Select menu, then select Save Selection. Then type in a name for the selection and click OK.
Quick keys are the best solution for faster photoshop work. The best photoshop professionals know most if not all quick keys to finish projects as fast as possible.
the masking tool
Use any selection tool from Toolbox on left side of screen (Window>Toolbox). Selections tools are Magic Wand (W), Quick Selection tool (W) Rectangular Marquee tool (M), Elliptical Marquee tool (M) or use powerful Color Range command from Select menu.
Alpha channel, take a look at CHANNELS palette