The sun protection factor, or SPF, indicates how safe you are from the sun.
The SPF rating indicates how much the sunscreen or sunblock protects you from UVB rays, which cause sunburn.
Most sunscreens also absorb UVA rays. The higher the degree of protection, the higher the SPF number.
Hence, it is essential that everyone should use sunscreen with an SPF of 30 or higher to avoid sun damaged skin.