Legal Question in Criminal Law in California

It means that the charges were dismissed, either by the prosecution for various reasons, such as:

they didn't think they had enough evidence to go forward;

they decided that further action wasn't necessary

it was dismissed for a plea in another case

or - if it applies to a particular charge, then perhaps it was dismissed for a lesser plea

If it was dismissed by the judge, then it could be because:

the judge had the legal authority to dismiss or strike a particular charge or allegation, such as a Romero motion to dismiss a strike

To be more specific, somebody would have to look at the document you're referring to and take it in context.