An herbicide is a type of chemical used to kill or control unwanted plants, commonly known as weeds. These substances work by targeting specific processes in plants, disrupting their growth and development. Herbicides are widely used in agriculture, gardening, and landscaping to protect crops and maintain healthy gardens. There are two main categories of herbicides: selective and non-selective. Selective herbicides target specific types of plants, allowing desired crops to thrive, while non-selective herbicides kill all plants they come into contact with. Proper use of herbicides is essential to minimize environmental impact and protect beneficial plants.