diff --git a/School/Analyse/Layers/1. Physical Layer.md b/School/Analyse/Layers/1. Physical Layer.md
index 8ab7910..cfbdb89 100644
--- a/School/Analyse/Layers/1. Physical Layer.md	
+++ b/School/Analyse/Layers/1. Physical Layer.md	
@@ -100,10 +100,19 @@ Distortion is the change that occurs in a signal that affects how the signal loo
 
 For example talking to someone while behind a thick glass pane changes how you sound on the other side.
 
-We can solve this by using a lower bit rate. Bit rate is kinda like 
-
+We can solve this by using a lower bit rate. Bit rate is kinda like the information per second. This way the signal is less susceptible to distortion.
 
 
 ### Noise
 
+![[noise-signal.png]]
+
+Noise is when data is added to a signal and therefore changing the data itself.
+
+Analogy for this when you are listening to someone talk and somebody else is talking at the same time trough your conversation.
+
+We can solve this by using a stronger signal (bit like talking louder).
+This will reduce the impact noise has on the signal.
+
+This is also called signal to noise ratio (SNR)
 
diff --git a/noise-signal.png b/noise-signal.png
new file mode 100644
index 0000000..bb03e4a
Binary files /dev/null and b/noise-signal.png differ