Need to understand about a solution

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Python

def reverse(text):
word = ""
l = len(text) - 1
while l >= 0:
word = word + text[l]
l -= 1
return word


please help me to understand about this solution. what & how it was made?

What I have tried:

def reverse(text):
word = ""
l = len(text) - 1
while l >= 0:
word = word + text[l]
l -= 1
return word