Step-by-step explanation:
SPF stands for "Sun Protection Factor." It is a measure of how effectively a sunscreen product will protect your skin from the sun's harmful ultraviolet (UV) rays. The higher the SPF number, the greater the level of protection.
An SPF 15 sunscreen will block about 93% of UVB rays, while an SPF 30 sunscreen will block about 97% of UVB rays. It's important to note that the difference between the two is relatively small, and both provide good protection against UVB rays. However, an SPF 30 sunscreen will provide slightly more protection than an SPF 15 sunscreen.