<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
What is a 2D array?
<|im_end|>
<|im_start|>assistant
A 2D array (or two-dimensional array) is an array of arrays, meaning it is a collection of elements which are themselves arrays. Each element in the 2D array can be thought of as a row, and the elements inside that row can be thought of as columns. The elements all have the same data type.<|im_end|>
