How much Ethereum supply is there?

I'm quite curious about the supply of Ethereum. Could you please enlighten me on how much Ethereum is currently in circulation? I've heard rumors about its limited supply, but I'm not quite sure how it works. Is there a specific cap or maximum number of Ethereum that can ever exist? And if so, what's the current number and how does it compare to other cryptocurrencies? Also, how does the supply of Ethereum affect its price and market value? I'm eager to understand the intricacies of this fascinating cryptocurrency.