How does Nasdaq make money?

Could you please explain in simple terms how Nasdaq, a renowned stock exchange, generates its revenue? Are there specific sources of income for Nasdaq, such as trading fees, market data sales, or technology services? Additionally, does Nasdaq's profitability vary based on market conditions, and if so, how does it manage to maintain stability in its earnings? Understanding Nasdaq's revenue streams and their relation to the broader financial landscape would be highly informative.