How do I check for differences...

Hi all, Let's say I have a text file I got one day, and a week later I get the text file again but want to compare the two to see if there are *any* differences at all between them, like the spelling of one word, or the ommission of a word or sentence, things like that? Thanks, JB -- "A nation can survive its fools and even the ambitious but it cannot survive treason from within. An enemy at the gates is less formidable for he is known and he carries his banner openly against the city. But the traitor moves among those within the gates freely." Cicero