The evolution of proteomics and metabolomics has significantly enhanced our understanding of microbial biology, enabling researchers to comprehend complex molecular processes and identify novel biomarkers, which in turn facilitate better diagnostic and therapeutic interventions. Proteomics facilitates the study of protein expression, modifications, and interactions on a large scale, offering insights into the functional dynamics of microbial cells. In contrast, metabolomics involves the analysis of small molecules, providing insight into the biochemical activities occurring within the system. The integration of these omics techniques has provided pivotal information, resulting in the elucidation of intricate regulatory networks that govern microbial physiology and pathogenicity. Multi-omics techniques have played a central role in overcoming the gap between the genotypic and phenotypic expressions. The current chapter discusses the principles and techniques behind two such omics techniques—proteomics and metabolomics, while emphasizing the importance of integrative omics strategies in unravelling the molecular mechanisms of microbial adaptation, virulence, and metabolism.