How many squares in 4x4 puzzle grid?

In a 4x4 puzzle grid, there are a total of 30 squares. This includes not just the individual 1x1 squares but also larger squares that can be formed, such as 2x2, 3x3, and the entire 4x4 square. Specifically, there are 16 (1x1), 9 (2x2), 4 (3x3), and 1 (4x4) square, which adds up to 30.