How are iloc and loc different?

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How are iloc and loc different?
df = pd.DataFrame({'col1': [1,2,3,4,5], 'col2': ["foo", "bar", "baz", "foobar", "foobaz"]})
  col1  col2
0   1   foo
1   2   bar
2   3   baz
3   4   foobar
4   5   foobaz

df = df.sort_values('col1', ascending = False)
      col1  col2
    4   5   foobaz
    3   4   foobar
    2   3   baz
    1   2   bar
    0   1   foo

# value at index location (iloc)
df.iloc[0, 0:2]
col1         5
col2    foobaz
Name: 4, dtype: object
# value at index label (loc)
df.loc[0, 'col1':'col2']
col1      1
col2    foo
Name: 0, dtype: object

How are iloc and loc different?
>>> s = pd.Series(list("abcdef"), index=[49, 48, 47, 0, 1, 2])
49    a
48    b
47    c
0     d
1     e
2     f

>>> s.loc[0]    # value at index label 0
'd'

>>> s.iloc[0]   # value at index location 0
'a'

>>> s.loc[0:1]  # rows at index labels between 0 and 1 (inclusive)
0    d
1    e

>>> s.iloc[0:1] # rows at index location between 0 and 1 (exclusive)
49    a

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