Toxic chemicals are substances that can cause harm to living organisms and the environment. They can be found in various forms, including solids, liquids, and gases, and may originate from industrial processes, agricultural practices, or household products. Exposure to these chemicals can lead to health issues, such as respiratory problems, skin irritation, or even long-term diseases. Common examples of toxic chemicals include pesticides, heavy metals like lead and mercury, and solvents used in cleaning products. It is important to handle these substances with care and follow safety guidelines to minimize risks to human health and the ecosystem.