This summary is not the rule. The rule text controls.
Here's a plain English summary of this rule:
When a court needs to pick people for jury duty, names must be pulled at random from the official jury pool. This pool is a list built ahead of time, usually from things like voter registration or driver's license records.
Court staff cannot grab random people off the street or pick jurors from any other source. Everyone who might serve on a jury has to come from that official list, chosen by chance rather than by someone picking who they want.
This rule keeps the jury selection process fair. It stops anyone from handpicking jurors or trying to influence who ends up on a jury panel.