does sun screen makes your skin darker?explain?10 pionts!?

i play football for half an hour or more in the sun in the after noon so i have to use sun screen for further tanning does it makes my skin darker and should will my sun screen of spf 15 be enough to prevent tanning?
explain how it works
hers the website which has details about the sun screen i use
http://www.trustwilliam.com/Skin-Care/Aloe-Vera-Sun-Lotion-SPF15/Product

no, sun screen only protects your skin. but i would suggust using like SPF 30 or 45. i hope this helps.

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