Arabica refers to Coffea arabica, a coffee species with a wide range of cultivated varieties and growing contexts. The source discusses familiar names such as Typica and Bourbon, showing why an Arabica label can cover many very different coffees.
A package marked one hundred percent Arabica tells you about its stated composition; it does not establish a particular flavor, freshness level or degree of care in production. Equally, the presence of Robusta in a thoughtfully designed blend need not be treated as proof that the product is unsuitable.
Go beyond the species statement by looking for origin, producer or lot information, processing, roast approach and a useful tasting description. Choose according to your normal drink and preparation method. If you are comparing an Arabica-only coffee with a blend, keep the recipe consistent enough to identify what you prefer. The most informative result is a clear account of the cup you enjoy, rather than a species slogan standing in for an evaluation.
The conversation
A good question can make a better brew.