The formation of Earth, occurring approximately 4.6 billion years ago, is driven by complex astrophysical and geochemical processes arising from the solar nebula, a rotating disk of gas and dust. Earth emerged through accretion, leading to differentiation into layers: the core, mantle, and crust. Crucial events, such as the Late Heavy Bombardment and the collision with Theia that formed the Moon, shaped its environment. Comparisons with other planets, both terrestrial and gas giants, highlight Earth’s unique conditions for habitability, including its optimal distance from the Sun, geological activity, and protective magnetic field, fostering life as we know it.