The seasons are reversed in the Southern hemisphere because of the tilt of the Earth's axis. The Earth rotates on its axis, which is tilted at an angle of approximately 23.5 degrees with respect to the plane of its orbit around the sun. As the Earth revolves around the sun, this tilt causes different parts of the Earth's surface to receive different amounts of sunlight at different times of the year.

When one hemisphere is tilted towards the sun, that part of the Earth receives more direct sunlight and thus experiences warmer temperatures and longer days. This is summer in that hemisphere. Conversely, when that hemisphere is tilted away from the sun, that part of the Earth receives less direct sunlight and thus experiences cooler temperatures and shorter days. This is winter in that hemisphere.

However, the opposite hemisphere is experiencing the opposite season at the same time, because it is tilted in the opposite direction. So when it's summer in the Northern hemisphere, it's winter in the Southern hemisphere, and vice versa. This is why, if it's winter in Europe, it's summer in South America, as you mentioned in your question.
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