Seasons change in different parts of the world due to the Earth's axial tilt and its orbit around the sun. The Earth is tilted on its axis by about 23.5 degrees, which means different parts of the world receive varying amounts of sunlight throughout the year.
As the Earth orbits the sun, different regions experience different seasons. For example, when the northern hemisphere is tilted towards the sun, it experiences summer while the southern hemisphere experiences winter. This is why countries in the opposite hemispheres have opposite seasons.
In regions near the equator, there is less variation in the length of days and nights, so they typically experience a wet season and a dry season instead of traditional four seasons. Overall, the changing of seasons is a result of the Earth's position relative to the sun and its axial tilt.
