Textual evidence are those facts that are used by an author to back up his claim
When an author makes a claim, he has to back it up using textual evidence that confirms that the claim is true. This is the difference between an opinion and a fact
Please note that the evidence must relate to the claim or topic and have similar context for it to be valid.
Your question is not complete therefore I will only be giving a general overview to help you understand the concept better.
Therefore, if an author made use of textual evidence to support his point of view, then it must be related and similar, and most of all, factual.
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