In temperate regions, the four seasons are typically defined as spring, summer, autumn, and winter. These seasons are based on the Earth's orbit around the sun and the tilt of its axis. As the Earth orbits the sun, different parts of the planet receive more or less direct sunlight, which causes the seasons to change.
In tropical regions, the seasons are not as pronounced as they are in temperate regions. The temperature and humidity may vary slightly throughout the year, but there is no significant change in the amount of daylight. As a result, some tropical regions only have two seasons: the wet season and the dry season.
In polar regions, the seasons are even more extreme. The days can be very long in the summer, and very short in the winter. The temperature can also vary dramatically from season to season. In some polar regions, the average temperature can drop below -40 degrees Fahrenheit in the winter.
So, while there are typically four seasons in temperate regions, the number of seasons can vary depending on the climate and culture of a particular region.