Well, an image’s Placement type determine the way the picture/control is attached to the cells or how it is placed in the cells in the worksheet.
i) Free floating --> it refers that if you change the cell(s) height or width, the image won’t change its height or width accordingly.
ii) Move(but do not size) --> it refers that if you change the cell(s) height or width, the image can be moved into the cell(s) if you want but it won’t change its height or width in accordance with the cells.
iii) Move and size) --> it refers that if you change the cell(s) height or width, the image will change its height or width / decrease or increase height/width accordingly.
You may insert an image into the Excel worksheet’s cells and right click on the picture and click “Size and Properites” to open the dialog and then click the “Properties” tab to exercise to better understand the options.