Post #3

Magic Wand:the Magic Wand selects pixels based on tone and colour. 
Quick Select:selects pixels with a similar colour.
Rectangular / Elliptical Marquee: Rectangular Marquee 

 Makes a rectangular selection (or a square, when used with the Shift key).

Elliptical Marquee 

 Makes an elliptical selection (or a circle, when used with the Shift key).

Single Row or Single Column Marquee

Defines the border as a 1‑pixel‑wide row or column.

Lasso:This is a freehand selection tool. Click and hold your left mouse button on the image and draw your selection.
Magnetic Lasso: This is a very handy tool for selecting areas which have reasonably well-defined edges. Left-click at the starting point of your selection and simply move the mouse along the edge.
Polygon Lasso:Similar to the lasso tool, except that instead of holding your mouse button down to draw, left-click on various points to create a selection with a series of straight edges.