What is the meaning of web.AllowUnsafeUpdates

If your code modifies Windows SharePoint Services data in some way, you may need to allow unsafe updates on the Web site, without requiring a security validation. You can do by setting the AllowUnsafeUpdates property.

C#:

using(SPSite mySite = new SPSite(<Server URL>))

 using(SPWeb myWeb = mySite.OpenWeb()) {

myWeb.AllowUnsafeUpdates = true;

SPList interviewList = myWeb.Lists[<ListName>];

SPListItem newItem = interviewList.Items.Add();

newItem[<ColumnName>] = "interview";

newItem.Update(); }