Categories according to WordPress FAQ are the descriptions of the topics I posted.
Default Categories side bar is represented in that image – – – – – – >
I have more than thirty listings in my homepage a confirmation of what the WordPress FAQ explains as;
To avoid the unavoidable growth from growing, Tag or tag came in to the picture. Actually, I guess that is not the only reason why there is tag. The WP-FAQ mentioned about confusion as it says;
“It was also confusing in that what we said were categories others said were tags. So now we have tags as well.”
The difference when I assigned Tags and Categories to a particular post is that Tags are located at the bottom of the page as seen below,
while Categories are located at the side bar.
The similarity I found is that I could see both options Categories and/or Tags whenever I am at Write Post mode and both options are not visible when I am at the Write Page mode.