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Birth control is the method of keeping a woman from becoming pregnant or giving birth. Birth control is widely availible in the US and most other countries. There are many different methods, each having its own level of effectiveness and safety. The 100% safest and most effective way being abstience. Other methods include pills, injections, or vaginal rings.
[http://www.nlm.nih.gov/medlineplus/birthcontrol.html | Information on Birth Control]