In rare cases an appeal of a guilty verdict may be allowable. This usually takes place where the judge has made an incorrect legal ruling that has made it harder for the defendant to get a fair trial. What is important to know here is that the majority of "appealable issues" are "waivable". What that means is that if the judge is not asked to make a ruling (such as to suppress evidence) or if a judges action (such as giving a particular instruction to a jury) is not objected to at trial the appeal may not be allowed. The idea is that the trial judge should at least be given a fair chance to do the right thing before appellate courts will get involved. Lodging those at-trial motions and objections that may serve as the basics of an appeal is called "making a record". If you ever hear an attorney in court say "Your Honor for the record..." this is what they are doing.