Endovenous laser therapy is when a doctor shines a special type of light inside a vein in your body to make it go away. Your veins are like tubes that carry blood around your body. Sometimes they get swollen and look lumpy, which can be uncomfortable and not very nice to look at. So, the doctor uses a tiny laser machine to shine a strong light inside the vein. This light heats up the vein and makes it close up so that it can't be seen or felt anymore. It's a bit like magic, but it's really science! The doctor might apply some special cream or medicine to make sure you don't feel any pain or discomfort during the procedure. It's a very safe and effective way to treat certain types of vein problems.