The Second Coming in Mormonism is when Jesus comes back to Earth after a long time to live with us and rule over us. It's like when your mom or dad goes to the store and comes back later to see you again. Mormons believe that Jesus will come back at some point in the future, but they don't know exactly when.
Mormons think that when Jesus comes back, the world will be a much better place. Everyone will be happy and nice to each other, and there will be no more sadness or bad things happening. Jesus will help fix everything that's wrong with the world.
Mormons also think that before Jesus comes back, there will be some signs that it's going to happen. For example, there might be a lot of wars or natural disasters. But they believe that these will all happen for a reason, and that Jesus will eventually make everything okay again.
When Jesus does come back, Mormons think that he will appear to everyone at once, so everyone will know that he's really here. It'll be like a big surprise party for the whole world. And like a good party, there will be lots of yummy food to eat and fun things to do.
Overall, the second coming in Mormonism is an exciting event that Mormons believe will bring a lot of joy and happiness to the world.