Colony Collapse Disorder (CCD) is when a lot of bees suddenly disappear from their hives. Scientists do not know what exactly causes this, but they think it might be from a combination of factors like diseases, pesticide use, and lack of food. When this happens, it makes it harder for farmers to grow food, because bees are important for pollinating plants and helping them grow. So if fewer bees are around, less food can be produced. It's important to help save the bees by planting flowers that they can use as a food source, avoiding the use of pesticides, and monitoring the health of hives.