The acronym COSHH stands for Control of Substances Hazardous to Health, and it's a set of regulations in the UK that control the use of hazardous substances in the workplace. Employers have a duty to protect their employees from any risks to their health, and COSHH is one way of doing that.

Some common hazardous substances include lead, asbestos, and mercury. When used safely, they can all cause no harm. But if they're not used safely, they can be very dangerous. That's why it's so important for employers to make sure their staff are trained in how to use them safely.

There are a number of important reasons why you should understand COSHH:

-Your safety at work: If you understand how to safely handle and use hazardous substances, you can reduce the risk of exposure to yourself and your colleagues.
-Legal compliance: All employers have a legal duty to comply with COSHH legislation. Failing to do so could result in prosecution.