A chemical is not just something used by scientists in laboratories - most people use chemicals as part of their job or at home every day
Cleaning products such as bleach and oven sprays are chemicals. So are paints, inks, glues, and oils. Most of the chemicals you might use at work are not dangerous if you use them properly and know what to do if something goes wrong (such as spillage). But some chemicals need more careful handling than others.
By law, suppliers of chemicals are required to label their products with hazard symbols, warnings and safety advice if a chemical is dangerous; managers in workplaces where chemicals are kept or used must ensure that the chemicals are used safely. Manufacturers may also include ‘instructions for use’ either on the label, or on a leaflet supplied with the product. Suppliers must provide safety data sheets for dangerous chemicals used in the workplace. This is a detailed information sheet provided by chemical suppliers to their customers so that workers and the environment can be properly protected.
Remember that many substances are hazardous to health when they are transferred from your hands onto food, cigarettes, etc and so taken into your body.
To avoid this, always follow good personal hygiene practices, for example:
Read the Risk and COSHH Assessment/s that apply to your work and make sure that you understand how the work is to be done.