AKAs can be any alternative name or date of birth used by or associated with the candidate in the past. Conducting the search on AKA names can help ensure that you do not miss records that were logged under another name, for example a maiden name or an abbreviated version of a first name.
When someone is arrested, if they do not have an ID on them they’ll be booked under whatever name they give to the police. Richard could be Rick, Elizabeth could be Beth, and John Joseph Smith-Johnson could be Joe Smith. These additional names are called alias names. When we look for records, we only have the name and date of birth to go on. Today, very often the individuals arrested provide an alternate name. If you are ONLY using the current legal name, or have search limitations such as LAST NAME ONLY, you might be missing records.