The binary search algorithm relies on the array being sorted in ascending order. When doing a binary search, the algorithm has a search interval in which checks if the element in the middle in the middle of the interval are equal to the value being searched for. If it is, the binary search is complete. If the value is not equal, then we divide the search interval in half. The side in which the search interval is split depends on whether the value we're searching for is less than or greater than the middle value we just checked. Picture the array horizontally, with the smallest elements on the left and the largest elements on the right. If the value we're searching for is greater than the middle value, we split the search interval into the right side of the array, with the left-most element in the search interval being the one just to the right of the middle element. If the value we're searching for is smaller than the middle value, then we split the search interval into the left side of the array, with the right-most element in the search interval being the one just to the left of the middle value. This process gets repeated until the value is found or, if it isn't in the array, isn't found. That is why the input array must be sorted in ascending order, because the algorithm relies on it. I hope that answered your question.
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