Funnily enough one of their down voted posts is a rant against that phrase in particular on unpopular opinions

First off not a lawyer, so take it with a grain of salt.

Being indicted means you are formally charged with a crime. Its the process of the court saying we think you did this crime and we’re starting to head towards a trial.

Arrested means that police or other law officers are taking you into custody.

Arraigned means you are brought before a judge to answer the charges. When arraigned you choose whether to plea not guilty or not.