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"firstItem" is a variable that stores the value at the first position (index 0) of an array. It serves as temporary storage before shifting all other elements in the array by one position.
A named container or storage location used to hold values that can change during program execution.
The content/data assigned to a variable. In this case, it refers to what's stored at the first position in the array.
Shift: To move or change the position of elements/values within a data structure.