Protected concerted activity is when workers come together to discuss or act on improving their work conditions, wages, or benefits. Imagine you and your friends play together every day and one day you want to ask your parents for a new toy to play with. You talk to your friends and they all agree that they want a new toy too. So, you decide to go to your parents together to ask for it. This is kind of like what protected concerted activity is. Workers can't be punished or fired for doing this, because it's protected by law. It's like having the right to speak up for yourself and your friends when something isn't right at work.