Protein gel staining is a crucial step in gel electrophoresis, used to visualise and analyse proteins separated within polyacrylamide gels. After electrophoresis, staining agents such as Coomassie Blue, Silver Stain, or fluorescent dyes are applied to bind proteins and make them visible. These stains differ in sensitivity, with Coomassie being less sensitive but faster, while Silver Stain offers higher sensitivity for detecting low-abundance proteins. Once stained, the gel reveals distinct bands representing different proteins, allowing researchers to analyse protein expression, purity, or molecular weight. Protein gel staining is essential in molecular biology, biochemistry, and proteomics for both qualitative and quantitative protein analysis. This process is widely used in research labs to study biological pathways, protein modifications, and cellular functions.