The area of a square is calculated using the formula:
\[ \text{Area} = \text{side length}^2. \]
Given that each side of Square A is 5 units, the area of Square A is:
\[ \text{Area of Square A} = 5^2 = 25 \text{ square units}. \]
When Square A is translated to create Square B, the size of Square B remains the same. Translations do not change the dimensions of shapes; they only change their positions on the coordinate plane.
Therefore, the area of Square B is the same as the area of Square A:
\[ \text{Area of Square B} = 25 \text{ square units}. \]
So, the area of Square B is:
\[ \boxed{25} \text{ square units}. \]