Please explain what a non-binding opinion is.

Depending on the context, a "non-binding opinion" can mean that it is merely an advisory opinion, or a recommendation of sorts. A "non-binding" opinion can also be an opinion that is rendered with the intention that the parties agree to voluntarily abide by the opinion handed down, but that the parties have retained their rights to pursue other aveneus, etc. The exact definition will usually depend on your particular case. If you post some additional detail, for example whether you are asking about a non-binding opinion that was rendered in connection with a business dispute, you may get better responses to your post.