This summary is not the rule. The rule text controls.
Here's what this rule means in everyday terms:
After the prosecution finishes presenting its case (or after both sides finish presenting evidence), the person on trial can ask the judge to end the case right there. This request is called a motion for judgment of acquittal. Basically, the defendant is saying "the evidence so far isn't strong enough to convict me, so let's stop this now."
The judge has to grant this request if the evidence presented simply isn't enough to support a guilty verdict. This means the judge looks at everything the jury has heard and decides whether a reasonable jury could actually find the person guilty based on that evidence. If the evidence is too weak or doesn't add up to a real case, the judge must dismiss the charges rather than let the trial continue.
If the judge grants this motion, that's the end of the case for good. The person can't be charged again for the same crime. This protects people from being tried over and over for something the evidence never actually supported in the first place.