Robusta is the familiar commercial name associated with Coffea canephora. It is distinct from arabica and generally contains more caffeine, but a species name alone cannot tell you the exact content or quality of a finished drink. Origin, farming, processing, roasting, blend composition and the brewing recipe remain important parts of the result.
Robusta appears in blends as well as coffees sold on their own. Its flavor can be described differently across products, so avoid treating a broad description such as earthy or intense as a guarantee that every bag will taste alike. Similarly, the lower price of some commercial robusta should not be turned into a rule that all robusta is low quality or all arabica is superior.
When exploring it, choose a seller that identifies the product clearly and buy a manageable quantity. Use a grind suited to your brewer rather than assuming robusta always needs an especially fine setting. If comparing a blend with a pure coffee, note the actual composition where disclosed. Judge the coffee in its intended serving, including milk or dilution if that is how you plan to drink it, and record the recipe that worked.

The conversation
A good question can make a better brew.