Proactivity means doing things before they become a problem. Imagine if you knew that your mom was going to need help carrying the groceries up the stairs, even before she asked you. You could be proactive and offer to help her before she even asks you. This means you are thinking ahead and trying to prevent any problems from happening, instead of waiting for someone to tell you what to do. It's like being prepared for what might happen in the future, so that you're ready to deal with it. Being proactive is a great way to show that you are responsible and helpful.