Why does my toilet gurgle when my tub drains?

When your toilet gurgles while your tub drains, it is likely due to a blockage in the Plumbing system. The gurgling sound occurs because air is being forced through the pipes as water drains, indicating that there is a restriction in the flow of water. This can be caused by a clog or a venting issue in the plumbing system. It is important to address this issue promptly to prevent further damage to your plumbing system.