There are rules of evidence that control what can be received into evidence. When a lawyer asks a question or offers an exhibit into evidence and a lawyer on the other side thinks that it is not permitted by the rules of evidence, that lawyer may object. If I overrule the objection, the question may be answered or the exhibit received. If I sustain the objection, the question cannot be answered, and the exhibit cannot be received. Whenever I sustain an objection to a question, you must ignore the question and must not guess what the answer might have been.
Sometimes I may order that evidence be stricken from the record and that you disregard or ignore that evidence. That means when you are deciding the case, you must not consider the stricken evidence for any purpose.