Is there a finite amount of Ethereum?

I'm curious, could you please explain if there's a set limit to the total amount of Ethereum that can be created and circulated in the market? Understanding the scarcity aspect of this cryptocurrency is crucial for investors like myself to assess its potential value and long-term prospects. Does Ethereum, like Bitcoin, have a predefined cap on its supply, or is its issuance mechanism more flexible and subject to change over time?