Devas are like super beings in Buddhism, kind of like superheroes from movies, but they are not real. In Buddhism, they are different from humans, animals and other creatures because they live in a special world. Think of it like a different planet, but without spaceships.
Devas are often described as very beautiful and have special powers, like being able to fly or make things happen just by thinking about it. They don't have to eat like humans do, but they can if they want to. Some devas are happy and peaceful, while others are a bit more grouchy and angry.
In Buddhism, it is believed that devas can be reborn (kind of like being born again) based on their actions and thoughts in their previous lives. This means that if they were really nice and kind in their past lives, they might be reborn as a happy and peaceful deva in their next life. But if they were not so nice, they might be reborn as an angry and grouchy deva.
Overall, devas are not real, but they are an important part of Buddhist teachings about karma (the idea that our actions have consequences) and rebirth.