How does push-button start work on cars?

Push-button start is standard on most modern cars, trucks and SUVs today. How does it work and is it better than ignition keys?
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Why did some cars have push-button transmissions? Explained

Push-button transmissions, a unique feature in automotive history, once captured the attention of car enthusiasts and ...
Yahoo

Republican senator who led the push to end mask mandates on planes and public transport tests positive for COVID-19 for the 3rd time in a year

GOP Sen. Roger Wicker of Mississippi just tested positive for COVID-19 for the third time in a year. Wicker led the push to end mask mandates for public transportation before a judge struck it down.