What does 2nd argument mean in converting to int()?

Question

Code:
print(int('0011',2))
Gives output : 3
Why can anyone tell me plz ?
I knew int is used to convert to integer but what if 2nd argument is mentioned ?

Answer 1

It is use to mention the base of 1st argument ,here it is binary(2)

Answer 2

𝐊𝐢𝐢𝐛𝐨 𝐆𝐡𝐚𝐲𝐚𝐥
I think help tells us about all the function of modules

Answer 3

𝐊𝐢𝐢𝐛𝐨 𝐆𝐡𝐚𝐲𝐚𝐥
What is help in python