Open-air preaching is a way of teaching about God and the Bible outside, in a public area where people can hear. Imagine going to a park with your friends, and a grown-up starts talking really loudly about God and Jesus for everyone to hear. That's open-air preaching!
The person doing the open-air preaching usually stands on a box or a step so they can be higher up and easily seen by everyone around them. They use a microphone or a loudspeaker to make sure their voice is heard over any noises in the area.
Open-air preaching is a way to share a message about faith and the teachings of the Bible with people who might not normally go to church. It can also be a way to express your beliefs to others and to encourage people to follow the teachings of God.
Sometimes people may not like the message being shared or may disagree with it. It's important to remember to be respectful of others' beliefs and opinions, even if they don't see the same things the preacher does.