Find a small tent-like cover

It’s a hood!

Whether it is traditional or digital photography, when your lens is facing the direction of the sun, since the lens is usually a combination of multiple groups of lenses, it is easy to produce flare, halo, and glare. Sometimes a certain area of ??the photo will appear white, and sometimes it will produce some halo. A lens hood can avoid these situations. Different lenses have different abilities to combat glare. Some are more likely to produce it, while others are not. But for beginners, these are not too important things. In severe cases, just use your hands to build a "small tent" on the lens.

You can put a hood on the Baidu picture to see if it is the one you mentioned