what does it mean when a vairable is = [] in oython code example

Example 1: python variable

Python variable

Example 2: python variables

#Varibles Guide:
a = 5 #NUMBER
b = "Varibles!" #STRING
c = True #BOOLEN  Hey, this is an edit, sorry for having it as true not True, caps matter.
d = False #BOOLEN Hey, this is an edit, sorry for having it as false not False, caps matter.