Standing in law means that a person who wants to sue someone else has to have a good reason to do so. Imagine you have a toy that your friend wants, but they haven't actually been harmed in any way by you having the toy. If your friend tries to sue you for the toy, they won't have standing because they don't have any reason to be upset with you having the toy. On the other hand, if your friend borrowed money from you and never paid you back, then you would have standing to sue them because they did something wrong to you. Basically, standing means that you have to have a good reason to go to court and sue someone.