diff --git a/43-Number_of_Connected_Components_in_an_Undirected_Graph.py b/43-Number_of_Connected_Components_in_an_Undirected_Graph.py
new file mode 100644
index 000000000..9e2456ff5
--- /dev/null
+++ b/43-Number_of_Connected_Components_in_an_Undirected_Graph.py
@@ -0,0 +1,31 @@
+
+class Solution:
+    def count_components(self, n: int, edges: List[List[int]]) -> int:
+        parent = [i for i in range(n)]
+        rank = [1] * n
+
+        def find_union(node: int) -> None:
+            result = node
+            while result != parent[result]:
+                parent[result] = parent[parent[result]] # path compression
+                result = parent[result]
+            return result
+
+        def union(node_1: int, node_2: int):
+            parent_1 = find_union(node_1)
+            parent_2 = find_union(node_2)
+            if parent_1 == parent_2:
+                return 0
+            if rank[parent_2] < rank[parent_1]:
+                parent[parent_1] = parent_2
+                rank[parent_2] += rank[parent_1]
+            else:
+                parent[parent_2] = parent_1
+                rank[parent_1] += rank[parent_2]
+            return 1
+        
+        result = n
+        for node_1, node_2 in edges:
+            result -= union(node_1, node_2)
+        return result
+