Gas Liquid Chromatography is a standard chromatographic method where computations of gaseous form or vaporised form. The purity of a substance can be determined with the help of Gas Liquid Chromatography. Review articles are a summary of the current state of understanding of a particular research topic. They analyze or discuss previously published research by scientists and educators rather than report on the results of a novel study. Article review comes in the form of a formal review and literature review and is a form of secondary literature. A systematic review determines the list of objectives, and then obtains all of the original documents used in the original. They then compared the results presented in these papers. The literature review, by comparison, provides a summary of what the authors believe is the best and most appropriate publication of the past. The concept of a "review article" is different from the idea of ​​peer-reviewed literature. The review may have been peer-reviewed, and the review may have been peer-reviewed.