A translation is the moving of an image. It keeps the shape and size.
A reflection is the mirror image of a figure. It can reflect across the x or y axis or any line on a coordinate plain. The size and shape of the figure stays the same.
A rotation is the spinning of an object. It can spin around the origin or just in the same quadrant. The size and shape stays the same.
A size transformation is the increasing or decreasing in size of a figure. It stays in the same spot and will have the same shape.