What is the difference between Python's re.search and re.match?

# example code:
string_with_newlines = """something
someotherthing"""

import re

print re.match('some', string_with_newlines) # matches
print re.match('someother',
               string_with_newlines) # won't match
print re.match('^someother', string_with_newlines,
               re.MULTILINE) # also won't match
print re.search('someother',
                string_with_newlines) # finds something
print re.search('^someother', string_with_newlines,
                re.MULTILINE) # also finds something

m = re.compile('thing$', re.MULTILINE)

print m.match(string_with_newlines) # no match
print m.match(string_with_newlines, pos=4) # matches
print m.search(string_with_newlines,
               re.MULTILINE) # also matches