For Loop:
The for loop is the best loop structure for iterating over an array or a collection. It provides a concise and efficient way to loop through the elements of an array or a collection.

Efficiency:
The for loop is more efficient than other loop structures because it allows you to specify the exact number of iterations. This is particularly useful when iterating over an array or a collection with a known length. The loop control variable is typically used to keep track of the current index or position in the array.

Initialization, Condition, and Increment:
The for loop has three components: initialization, condition, and increment. These components are defined within the parentheses after the keyword "for".

- Initialization: This is the initial value of the loop control variable. It is executed only once before the loop starts.
- Condition: This is the condition that is evaluated before each iteration. If the condition is true, the loop continues; otherwise, it exits.
- Increment: This is the operation that is performed at the end of each iteration. It is used to update the loop control variable.

Example:
Here is an example of a for loop that iterates over an array:

```java
int[] numbers = {1, 2, 3, 4, 5};
for (int i = 0; i < numbers.length;="" i++)="" />
System.out.println(numbers[i]);
}
```

In this example, the loop control variable `i` is initialized to 0. The loop continues as long as `i` is less than the length of the array `numbers`. The loop control variable `i` is incremented by 1 after each iteration. The loop prints each element of the array.

Conclusion:
The for loop is the most suitable loop structure for iterating over an array or a collection. It provides efficiency, control, and clarity in looping through the elements. It allows you to specify the exact number of iterations and easily access the elements of the array or collection.