What are the meaning of * if it given as argument?also what are various meaning of * in python?

Answer 1

It can be used for tuple unpacking
like a,b,c,*d = 1,2,3,4,5,6
here all extra values are packed in d as a list
print(d)
>[4,5,6]
It can be used to unpack values in a function like print(*d)
4 5 6
It can be used to define arbitrary number of parameters in function definition, as honfu said

It can be also used as keyword arguments, same as above but instead of packing arguments as tuple it store them as dict
Its usage is **kwargs in function definition.
These are some i remember atm

Answer 2

Using * with a function parameter x allows you to pass as many arguments as you want, they'll all be put into a tuple with the name x.