A synopsis is a summery of a story, for example, pretend that there's a story about a kitten named Kitty who is driven out of her home by a new cat and meets a dog named Spotty and then they go on a journey to find new owners. Now, since you'll get the idea of the story, here's an example 'synopsis'.

Example Synopsis:
Little Kitty, a household kitten, lives in a little cottage with her owners. But one day, she is driven out of her home and is forced to find a new one. Then she meets a dog named Spotty, who was also driven out of his home, and together, they must face the dangers outside their former homes.