An arrest record is a record of a person's history of being arrested by law enforcement.
Arrest records are different from criminal records, because an arrest record only shows that the person has been arrested; it does not show that the person has been convicted of a particular crime.
Arrest records are public records. This means that anyone can search for a specific person's arrest record (such searches are often conducted online).
Certain arrests can be expunged from a person's arrest record. For example, if a warrantless arrest was made when a warrant was required, then such an arrest could potentially be expunged from the record.
Being arrested merely means that a person is suspected of, or has been accused of, committing a crime. The person can be found guilty of committing the crime only after they have been tried.