Ablation is a medical procedure that involves removing something from the body or its system. In the context of vein treatment, ablation means permanently closing a vein, effectively removing it from the venous circulation. There are several methods to achieve this. One common technique involves inserting a small tube called a catheter into the vein, which delivers heat to close the vein over time. Another method uses a special medical adhesive or glue to seal the vein. Both methods render the vein non-functional, meaning it remains in the body but no longer serves as part of the venous system because it has been permanently closed.