For some time that Isee people that don´t now what is vector!
They talk in pictures and pixels. They say that are creating vector art in photoshop and when they enlarge the image, they see large pixels. That is not vector! That one image with pixels like a photo.
Vector is draw with programs like corel or illustrator, were the lines are mathematical formulas. Were you say to the computer (I want one anchor point here and another here) and the computer draw a line or a gradient. You don´t paint like in photoshop.
Vector don´t have pixel.
Vector can by scale to any size without lost any quality.
What a vector file looks like.