Imagine Earth. Now fill the skies with thick, sun-obscuring clouds of sulfuric acid; boil off the oceans by cranking up the temperature to 900 degrees Fahrenheit (nearly 500 degrees Celsius), and boost the air pressure high enough to flatten you like a pancake. What you now have is Venus, a rocky planet similar in size to Earth but different in almost every other way.
Source:
https://phys.org/news/2020-07-veritas-exploring-deep-truths-venus.html