A persona in this case is simply a role.
Adding a persona to your prompt will give context for the type of response that you are looking for.
Consider the following prompts
Those prompts will likely give you very different responses.
If no persona is indicated, like in prompt #1 above, one will be chosen at random.
Try asking ChatGPT the same question but give a different persona each time and see how much the response changes each time.
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