Didn't see this , sorry.
PS displays an object as what could be called pseudo vector. Images of this sort are pixel based .
A vector is composed of geometrical primitives such as points, lines and shapes or polygons which are all based on mathematical equation, to represent an image . These are created by applications like Illustrator and Corel Draw. That said, a vector is characterized by true , solid jagged edges when zoomed up close but appears smooth when viewed at normal size..
Unlike an image or object created in PS, when a vector is resized up or down, it will not loose its pizel quality . Doing that in PS , you will notice that the object or image begins to pixelate and loose quality.
And even if you resize up or down a vector image in it's native application and save a copy of the document, the transformation does not affect the size of the files in a substantial way because all information resides in the structure of the vector object.
