Why dict.get(key) instead of dict[key]?

I came across the dict method get which, given a key in the dictionary, returns the associated value.

For what purpose is this function useful? If I wanted to find a value associated with a key in a dictionary, I can just do dict[key], and it returns the same thing:

dictionary = {"Name": "Harry", "Age": 17}
dictionary["Name"] == dictionary.get("Name")      # True

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_{See also: Return a default value if a dictionary key is not available}