[Python] What's the difference between is and == in Python?

I'm a bit confused about the difference between is and == in Python.

For example:

a = [1, 2, 3]
b = a
c = [1, 2, 3]

print(a == b) # True
print(a is b) # True

print(a == c) # True
print(a is c) # False

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