diff --git a/School/Analyse/Layers/1. Physical Layer.md b/School/Analyse/Layers/1. Physical Layer.md
index f9d2532..99ec030 100644
--- a/School/Analyse/Layers/1. Physical Layer.md	
+++ b/School/Analyse/Layers/1. Physical Layer.md	
@@ -52,6 +52,7 @@ Phase specifies the location or timing of a point within a wave cycle of a repet
 
 ## Analog
 **Analog Signals** can have a infinite number of possible values in a range.
+
 For example: 0.0 <-> 1.0
 - 0.1436367436473......
 - 0.54454764654765......
@@ -59,7 +60,19 @@ For example: 0.0 <-> 1.0
 **Analog data** is continuous and have continuous values. 
 Values in analog data are always changing.
 
-A good analogy for analog data is like a physical clock with 
+A good analogy for analog data is like a physical (analogue) clock with hands.
+The hands on a clock like that are always moving (continuous) and do not have a specific value.
 
 ## Digital
+Digital data is information represented as a string of discrete symbols each of which can take on one of only a finite number of values from some alphabet, such as letters or digits.
+
+For example:
+- a
+- b
+- 1
+- 0
+
+These values are specific and are not changing.
+
+