What is a pixel (px) in CSS?

Question

I am reading an ASP.NET book and it refers to CSS files and talks about pixels. But I never understood it from a resolution, layout, etc. point of view. For example, what does t

Answer 1

"A pixel is not a little square" is a good discussion on what a pixel is.

It might not be relevant to your specific question, but if anyone else finds this thread for a computer graphics related problem, this is great reading.