A safety data sheet (SDS) is a document that lists information relating to occupational safety and health for the use of various substances and products. SDSs are a widely used system for cataloguing information on chemicals, chemical compounds, and chemical mixtures. SDS information may include instructions for safe use and informing of potential hazards associated with a particular material or product, along with procedures for handling spills. SDS formats can vary from source to source and country to country depending on national requirements.