Starting January 1, 2025, tourists from visa-exempt countries are required to apply for an Electronic Travel Authorization to Israel (ETA-IL). You can apply for it via the official government website and you should do so once you have booked your flight(s).
For more information and eligibility: Population and Immigration Authority
The application form can be found here: Apply for an ETA-IL
Advice: Beware of fraudulent websites/companies who take exorbitant fees. As of this writing, the fee at the Israeli government website is 25 NIS, or around $8.