Can I display Classified categories only

Hi, I wanted to know if it is possible to use a shortcode to just display a particular category instead of the whole list.
Foe example only if there was a category of 'red cars' can this category content be shown within a page on its own?
I thought it might be but I cannot see how to ID a category to replace the 'list' in the shortcode.

Also what is the category tag? How is this different to the category and why is it needed?