What is the general approach we follow when we try to add / edit a SPListItem 
using the SharePoint object model? Yes I know it! Almost everybody will have a 
common answer to this (which is something similar to what is provided below).

SPListItem item = SPList.Items.Add();

item["Column1"] = "value for column 1";

item["Column2"] = "value for column 2";

item.Update();

The last line in the code above "item.Update()" does the final task of updating 
all the assigned value for that specific item within the SPList.

But is this the only way to update an item? No, we can also update the same 
item using

item.SystemUpdate();

Thanks,
Bijayani
Learn about SharePoint 2010 Migration

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