Questions & Answers about La realtà è diversa.
Because realtà is a noun, and in Italian nouns often take an article where English may or may not use one.
Here, la realtà means reality in a general sense. Italian commonly uses the definite article with abstract nouns like this.
So:
- La realtà è diversa. = Reality is different.
Even though English does not use the, Italian normally does here.