Catheter ablation is a minimally invasive technique in which your doctor inserts a flexible thin tube (catheter) into your blood arteries and into your heart tissue to ablate (halt) faulty electrical pathways (signals). The catheter ablation procedure is demonstrated in the animation above.
Reference: Medtronic. (n.d.). What Is It? - Catheter Ablation for Atrial Fibrillation. Retrieved from https://www.medtronic.com/us-en/patients/treatments-therapies/catheter-ablation-for-atrial-fibrillation/about-the-therapy/what-is-it.html