Apoptosis is programmed cell death undertaken by the body as part of a normal biological process in multicellular organisms. This is accomplished through biochemical reactions. This is an internal process.
Whereas apoptosis is a normal process, necrosis is an abnormal process. Necrosis means death of cells and or tissues or organs. Remember, cells make up tissues which make up organs. If something is necrotic, it is dead. Necrosis occurs in living tissues either from disease or trauma. Necrosis has an external etiology. A good example of necrosis is when a diabetic injures a toe, the toe becomes infected, the toe starts to die (become necrotic) because the diabetic tissue can't heal normally.
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