rawbody or body

[Tim Macrina]

Can anyone explain to me what the difference is between rawbody and
body when writing spamassassin rules. I am currently using body for
most of my body rules but I did find one that was not working. I was
looking for a specific html tag and it did not work but when I changed
it to rawbody it worked. can I/should I change all my rules to use
rawbody. Thank you