Do you need both primer and setting spray?

Excuse me, I'm a bit confused about the use of primer and setting spray in makeup application. Could you please explain if it's necessary to use both of them, or is one sufficient? I've heard different opinions on this matter, and I'm wondering if there's a standard practice or if it depends on personal preference and skin type. Additionally, could you elaborate on the benefits of each product and how they work together to enhance the longevity and appearance of makeup? Thank you in advance for your insights.