What does a single-edged sharp knife mean? Have you got any pictures?

The common point of single-edged sharp knife weapons is that our fruit knife and kitchen knife are both single-edged sharp knives, highlighting the single edge. On the one hand, he doesn't open the blade, and on the other hand, it is absolutely sharp and convenient to cut things. On the other hand, there is a sharp double-edged knife. For example, a pig-killing knife has two blades, which are usually used to stab things. The picture cannot be copied. You can look for pictures of fruit knives and kitchen knives yourself.