A corona is a type of cigar with a size of 5.5 to 6 inches in length and a 42 to 44 ring gauge (the diameter). Coronas typically have a mild-to-medium flavor profile and can last up to 45 minutes.
A robusto is another type of cigar, usually 4.5 to 5 inches long with a 50 ring gauge or higher. Robustos tend to have more intense flavors due to their thicker construction, as well as burn slower than coronas which results in longer smoking time of around an hour or more.