The act of inserting new elements into a data structure, such as an ArrayList, at a specific position or at the end.
Think of adding elements to an ArrayList like adding toppings to a pizza. You can add them one by one, either on top of existing ones or at the end if there are no toppings yet.
Insertion point: The position in which an element should be added within a data structure.
Append: To add an element at the end of a data structure.
Overwrite: To replace an existing element with a new one in a specific position within a data structure.
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