diff --git a/python-classes/3-square.py b/python-classes/3-square.py
new file mode 100755
index 0000000..dc12a7b
--- /dev/null
+++ b/python-classes/3-square.py
@@ -0,0 +1,22 @@
+#!/usr/bin/python3
+"""Define a class Square."""
+
+
+class Square:
+    """A class that defines a square"""
+
+    def __init__(self, size=0):
+        """Initialize a new Square.
+
+        Args:
+            size (int): The size of the square.
+        """
+        if not isinstance(size, int):
+            raise TypeError("size must be an integer")
+        elif size < 0:
+            raise ValueError("size must be >= 0")
+        self.__size = size
+
+    def area(self):
+        """Public instance method that returns the current square area"""
+        return (self.__size**2)