Genus

A genus is a group of closely related species that have more characters in common with one another than they share with the species of any other genus. In other words, a genus is an aggregate of closely related species.

Examples make the level clear:

• Potato and brinjal are two different species, yet both belong to the genus Solanum.
• Lion (Panthera leo), leopard (Panthera pardus) and tiger (Panthera tigris) share several common features and are all species of the genus Panthera. …