Detailed answer

Sunscreen can help prevent tanning by protecting the skin from the harmful ultraviolet (UV) rays of the sun. It works by either absorbing or reflecting the UV radiation, preventing it from penetrating the skin and causing tanning or sunburn. Sunscreens with a high Sun Protection Factor (SPF) provide better protection against tanning. However, it's important to note that no sunscreen can provide 100% protection, and reapplication is necessary after a certain period of time or after swimming or sweating. It is also important to combine the use of sunscreen with other sun protection measures such as seeking shade, wearing protective clothing, and avoiding peak sun hours to further reduce the risk of tanning.