Why get an expungement?
When you apply for some jobs, apartments, and licenses they will look at your criminal record. If you have a conviction on your record, it is unlikely that you will be chosen for the job, given the apartment to rent, or allowed to get a license. When you appear as a witness in court, they will ask you about your past criminal record. If you have a conviction, they are unlikely to believe that your testimony is true. Once your record is expunged nothing will show up when your record is checked. After expungement is finished, when asked about your past criminal record, you can honestly say that you have none. You can act as if the arrest and conviction never took place.