Question

what is the difference between the taxon and category?

Answer 1

Most basically taxon is a group of living organisms and a category tends to indicate rank/status for that particular taxon.

For example: In case of humans we have Order-Primates. Here 'Primates’ is the taxon and 'Order' is the category ( for that particular taxonomic category i .e. Primates).

So, overall taxon can be simply defined as the group of organisms occupying a particular category/rank.

Answer 2

Is there any differences between the terms Category, Rank and Taxon or they all are same?

I remember an explanation which goes on like this:

Category and Rank are the same and are the categories of taxonomic heirarchy whereas taxons are the organisms present in those.