In this article I provide an overview of the The Australian Microcap & Nanocap landscape and look at some of the opportunities these companies present for investors portfolios. I review the diversification benefits they can bring to a portfolio not just in terms of market capitalisation but also sector diversification. I recap their recent returns and performance versus the ASX 300 and the divergences in dividend yield versus the top end of the ASX. This will be the first in a number of articles I will be doing on investing ASX microcap and nanocap companies.