what is range(x,0,-1) in python code example

Example: range() python

#can be used a sequence of numbers
x = range(6)
print(x)
#Outputs 0 1 2 3 4 5

for i in range(start,finish ,step) 
#gives range of numbers
#start is optional default is 0
#finish needed specifying when to stop
#step is incremetntaition of jump also optional