diff --git a/1_DL_base/ReLU.py b/1_DL_base/ReLU.py
new file mode 100644
index 0000000000000000000000000000000000000000..9aedb350261f89c678bfe59b9f8f3c31dbcd82b3
--- /dev/null
+++ b/1_DL_base/ReLU.py
@@ -0,0 +1,19 @@
+import numpy as np
+from exercise1_material.src_to_implement.Layers.Base import BaseLayer
+
+
+class ReLU(BaseLayer):
+
+    def __init__(self):
+        super().__init__()
+        self.buffered_input = None
+
+    def forward(self, input_tensor):
+        self.buffered_input = input_tensor
+        input_tensor[input_tensor < 0] = 0
+        return input_tensor
+
+    def backward(self, error_tensor):
+        error_tensor[self.buffered_input <= 0] = 0
+        return error_tensor
+