"El español es un idioma interesante."
Translation:Spanish is an interesting language.
"Idioma" is one of several masculine words ending in "-ma": tema, problema, programa, drama, clima, etc.
This rule is true for words of Greek origin ending with "-ma." However, words that are not of Greek origin are typically female (e.g. the llama / la llama, the dame / la dama).
The reason for this is that in Greek these words were originally neuter, and they remained neuter when they were absorbed into Latin. However, as Spanish diverged from Latin, those neuter words became masculine.
I believe the difference matches the two English words they most often directly translate to: 'idoma' = 'language' and 'langua' = 'tongue'. In English the word 'tongue' can be used in place of 'language' in certain contexts. Likewise in Spanish.
ALL languages are interesting! I wish I had more lives to learn/learn about them! An extra language is never a burden. Do you hear me, Brits?