Can you use Wi-Fi without Internet access?

Can you please explain to me in simple terms if it's possible to use Wi-Fi without having access to the internet? I've heard some conflicting information and I'm trying to understand the concept better. Is there a specific way to set up Wi-Fi that allows devices to connect to each other without needing an internet connection? If so, what are the benefits and limitations of using Wi-Fi in this manner? Thank you for your help in clarifying this for me.