Used in microbiology laboratories to detect and differentiate Staphylococcus aureus from other staphylococci in clinical, food, and environmental samples. The agar contains chromogenic substrates that react with enzymes specific to S. aureus, producing distinct colored colonies—typically blue or bluish-green—making identification rapid and easy without the need for additional confirmatory tests. This selective and differential property reduces processing time and improves accuracy in diagnosing infections or monitoring contamination in pharmaceutical and food production settings. It is especially useful in hospitals for screening MRSA and in quality control labs for sterility testing.