Weeds are one of the worst things that can happen to a farm. Every year, they steal water, nutrients, and sunlight from crops, which costs farmers around the world a lot of money. The old answer was easy: spray the whole field with chemicals that kill weeds and hope for the best. But this method costs a lot of money, pollutes the soil, and makes weeds stronger and harder to kill over time. Weed management based on sensors is a better way to do things today. Sensors, which are special electronic "eyes," are put on tractors, drones, or robots. These sensors look over the field, find the exact spots where the weeds are growing, and then spray only those spots. The rest of the field is not touched. This means that farmers will use a lot fewer chemicals, which will save them money and make the world a cleaner place for everyone.