Details on the hyperisor architecture, type of virtualization and footprint. The size/footprint is purely for reference purposes and by no means recommended sizes (actual sizes will vary greatly) as there are various approaches to measuring the size of the hypervior and the relevance of the size itself is questionable and often misused for marketing purposes. In general smaller hypervisor footprint can result in a smaller (security) attack surface and fewer updates - which is desirable.