Planetary visibility refers to how easily planets can be seen from Earth. This visibility depends on factors like the planet's position in its orbit, the time of year, and the brightness of the planet itself. Some planets, like Venus and Jupiter, are often bright enough to be seen with the naked eye, while others may require a telescope. The best times to observe planets are during specific events, such as conjunctions or oppositions, when they are closest to Earth. Light pollution and atmospheric conditions also affect visibility, making it important to find dark, clear skies for optimal viewing.