This summary is not the rule. The rule text controls.
If evidence actually matters to the case, courts will generally let it in. This means if a piece of evidence helps prove or disprove something important to the case, a judge should allow it to be shown or discussed, unless some other law or rule specifically blocks it.
On the flip side, if evidence has nothing to do with the case and doesn't help answer any of the real questions being decided, the court won't allow it. Judges use this rule as a basic starting point: relevant evidence gets in unless another rule says otherwise, and irrelevant evidence stays out no matter what.
This matters for you because it means both sides in a case can only bring up facts and evidence that connect to what's actually being argued. It keeps trials focused and stops people from bringing up unrelated information just to confuse the jury or waste time.
