What exactly is SPF in skincare ? And why does it hold so much importance  ?

SPF stands for Sun Protection Factor, and the number beside it indicates how well the sunscreen protects skin against sunburn.

SPF full form is Sun Protection Factor (SPF), its value indicates how effective a product is at blocking UV rays when applied liberally to the skin. A product with a higher SPF protects the skin from more sun rays, but the level of protection does not increase linearly as the SPF value rises.

The SPF rating technique determines how long your skin can be exposed to direct sunlight before it starts to burn (remember, sunburn is caused by UVB radiation). For example, an SPF 30 product will shield your skin from about 97 percent of UVB rays, while an SPF 50 product would protect you from 98 percent.