It is an international standard that shows the time that a person can remain exposed to the sun's rays without suffering from sunburns. The higher the SPF, the more protected you will be from UVA/UVB rays.
For example, if a person with fair skin is exposed to the sun, they will get sunburns after 10 minutes. If this person wore a SPF 15 sunscreen, they could spend 2 hours 30 minutes in the sun before getting sunburnt.
The color of our skin is determined by melanin. At one end of the melanin spectrum there are people with light complexion or with few melanin, and at the other end there are people with brown and black complexion or with melanic protection. In addition to knowing your phototype, it is important to know the recommendations of the Sun Protection Factor (SPF) that you should use. Remember that in the central hours of the day (from 10:00 am to 4:00 pm) as well as in summer, you must use high protection. Knowing the phototype of your skin is very important so that you can choose the best suited protection. Here we present you a table so that you can identify it: