Identity is something that defines who you are. Without it, everyone would be the same. Exactly the same. Without it, we wouldn't have any friends or enemies. We wouldn't have a personality. We would just be workers with no voice, no personality. Like robots.
Identity is what makes us different from everyone else. With it, we can make friends and interact with them. We can invent things, enjoy good food, have fun and interact with the world around us. With an identity, we can have personality and can tell other people apart by their identities.