diff --git a/node-concepts/src/leetcodes/src/graph/adjacency-list/index.ts b/node-concepts/src/leetcodes/src/graph/adjacency-list/index.ts
new file mode 100644
index 0000000..664c0c2
--- /dev/null
+++ b/node-concepts/src/leetcodes/src/graph/adjacency-list/index.ts
@@ -0,0 +1,27 @@
+type AdjacencyList = {
+	[node in 'A' | 'B' | 'C' | 'D' | 'E' | 'F']: string[];
+};
+
+/** Example Adjacency List */
+const graph: AdjacencyList = {
+	A: ['B', 'C'],
+	B: ['A', 'D', 'E'],
+	C: ['A', 'F'],
+	D: ['B'],
+	E: ['B', 'F'],
+	F: ['C', 'E'],
+};
+
+/** Add Edge */
+function addEdge(graph: AdjacencyList, node1: string, node2: string) {
+	if (!graph[node1]) graph[node1] = [];
+
+	if (!graph[node2]) graph[node2] = [];
+
+	graph[node1].push(node2);
+	graph[node2].push(node1);
+}
+
+addEdge(graph, 'G', 'H');
+
+console.log('graph -> ', graph);