Salicylic acid (SA) is essential for plant defense and plays an important role in many physiological processes, allowing plants to perform well under stress. SA modulates both biotic and abiotic stress responses by activating signaling pathways that cause the formation of secondary metabolites such as alkaloids, flavonoids, terpenoids, and phenolics. Secondary metabolites help plants protect against infections, pests, and adverse environmental conditions. SA’s potential to increase secondary metabolite formation has significant agricultural ramifications. SA may boost crop tolerance to pathogens and reduce environmental stress by increasing the production of these plant bioactive compounds. SA serves as a valuable elicitor in plant biotechnology, enhancing secondary metabolite synthesis for applications in medicine, food industries, and agriculture. This chapter explores the potential of SA-based elicitation in pharmaceutical and agricultural areas, focusing on its involvement in the production of important plant bioactive chemicals.