diff --git a/Data Structures/adjacencyMatrix.js b/Data Structures/adjacencyMatrix.js
new file mode 100644
index 0000000..1bc7998
--- /dev/null
+++ b/Data Structures/adjacencyMatrix.js	
@@ -0,0 +1,22 @@
+// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/adjacency-matrix
+
+const row = [];
+for (let i = 0; i < 5; i++) {
+  row.push(0);
+}
+const adjMatUndirected = [];
+for (let i = 0; i < 5; i++) {
+  adjMatUndirected.push([...row]);
+}
+const edges = [
+  [1, 4],
+  [1, 3],
+  [3, 5],
+  [4, 5],
+];
+edges.forEach((e) => {
+  adjMatUndirected[e[0] - 1][e[1] - 1] = 1;
+  adjMatUndirected[e[1] - 1][e[0] - 1] = 1;
+});
+
+console.log(adjMatUndirected);