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SPF
SPF stands for Suncreen Protection Factor or protective factors from the sun. Each product cosmetics and sunscreens usually include a number indicating the level of SPF, such as SPF 15, SPF 30, and so on. SPF level of security to determine the time your skin exposed to sunlight. For example sunscreen with SPF 15 means your skin will be protected for 15 times longer than the natural resistance of your skin. If you usually experience skin redness after 10 minutes of basking in the sun wearing SPF 15 sunscreen, your skin is safe for the 15×10-minute 150 minutes.

SPF numbers are available from 2 to 60. But it does not mean the higher the SPF number will work as a multiple of that number. The fact that there is a SPF 50 just to give more protection around 1% to 2% compared to SPF 30. To remember is that SPF only applies to protect against UV-B radiation alone.
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UVA and UVB
Ultraviolet rays that enter the earth within a radius of A, B and C (UV-A, UV-B and UV-C). However, UV-C can be inhibited effectively by the ozone layer. While UV-A and UV-B can enter the earth’s surface while also been filtered by the earth’s atmosphere.
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Sweatproof
Sunscreen labeled sweatproof usually resistant to sweat, so do not fade due to sweat.
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Water resistant
Sunscreen is water resistant labels can provide protection up to 40 minutes if exposed to water or sweat.
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Waterproof
Sunscreen with a waterproof labels can provide longer protection than a sunscreen that is labeled water resistant up to 80 minutes if exposed to water or sweat. Suitable for use if you’re swimming.
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Sunblock
Sunscreen sunblock is a function of the physical block or reflect sunlight through the skin surface. Physical sunscreens usually contain zinc oxide or titanium dioxide that served UV radiation. However, can only block the sun block UV-B rays.
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Organic Sunscreen
Organic sunscreen is a type of chemical sunscreens which function to absorb or filter ultraviolet radiation (UV). Chemical sunscreens usually contain such octylcrylene, avobenzone, octinoxate, octisalate, oxybenzone, homosalate, 4-MBC, or para-aminobenzoic acid (PABA). Sunscreen could give more protection than a physical sunscreen because it can absorb UV-A radiation and UV-B. UV-A radiation to penetrate the skin deeper than UV-B, which can cause skin cancer