In which case do we use 2 colons i.e. [::] in list function ? Is this what we call stepper ?

Question

We can also use these 2 colons for reversing a string in list ?
For eg. [::-1] This will reverse the string.
Is it correct that same way we can reverse it with the reverse method?
For eg.
sample = input(" ")[::-1]
Above code will reverse the string. And the same way with reverse method also, can we do the same ?

For eg.
sample = input(" ")
sample.reverse()
print(sample)

Could someone please help me out with this uncertainty regarding :: and reversing a string ?
Thank you in advance!

Answer 1

What exactly are you unsure about? Have you tried it out in the playground?

indexing -- <iterable>[start:stop:step]

Answer 2

Slick I was unsure about the slicing. But abol cleared it by sharing his post. Thanks. But still there are still 2 doubts. First is reversing a string. Is it possible to do it without using the reverse. method?
Second is agaim about slicing but using - (minus sign).
Could you please give me an example with explanation for slicing with minus at the end?
I would be highly obliged.