Why does a light occasionally appear when taking pictures with a digital camera?

The first thing that is certain is that this is a lens flare. It is because when this photo was taken, the sun was shining directly or obliquely on the camera lens. At the same time, you can check whether there are fingerprints or dust or other debris on the camera lens. Generally, if there are debris, it will aggravate the halo. When shooting similar scenes in the future, try to avoid direct light. If it cannot be avoided, just Use your other hand to block the sun above the lens.