Yang-Baxter equation is an important matrix functional equation introduced in statistical mechanics. Yang-Baxter equation is extermely important in the area of quantum integrability and the framework of quantum inverse scattering method developed by Faddeev in the 80s-90s. In this seminar. In this seminar, I will introduce the Yang-Baxter equation and some of its simple solutions along with the toy model XXX, XXZ and XYZ Heisenberg Chain