Visualization in python through histogram

Mission: Exploratory Data Visualization
step-4

I don’t seem to understand why are we passing range(0,5) parameter here

ax.hist(reviews[“Fandango_Ratingvalue”],range=(0,5))
image
is the output when i pass the range and if don’t pass the range, i get the following results.
ax.hist(reviews[“Fandango_Ratingvalue”])
image

Can you please help me understand what is the reason behind passing the parameter. Further more why is there drastic change between the two graphs despite the fact that in both of them the x-axis is ranged from 0,5

Hey,
Look carefully the second graph ranges (2.5,5) while the first one from (0,5) on the x- axis/