This article provides a comprehensive review of topological materials, focusing on Weyl semimetals (WSMs) and their unique properties. WSMs are characterized by linear dispersion around nodes, known as Weyl points, which are the three-dimensional analogs of Dirac points in graphene. The authors introduce the TaAs family as an ideal material for understanding Weyl points, discussing their bulk and surface states, chiral magneto-transport properties, and the presence of Fermi arcs. They also explore the search for type-II WSMs in compounds like WTe₂ and MoTe₂, where the Weyl cone is strongly tilted, leading to different transport and optical properties compared to type-I WSMs. Additionally, the article highlights the multifunctional nature of Heusler compounds, which can exhibit both topological insulator and WSM properties. The authors emphasize the importance of precise control over material parameters to realize topological phases and discuss the potential applications of WSMs in high-speed electronics, spintronics, and catalysis.This article provides a comprehensive review of topological materials, focusing on Weyl semimetals (WSMs) and their unique properties. WSMs are characterized by linear dispersion around nodes, known as Weyl points, which are the three-dimensional analogs of Dirac points in graphene. The authors introduce the TaAs family as an ideal material for understanding Weyl points, discussing their bulk and surface states, chiral magneto-transport properties, and the presence of Fermi arcs. They also explore the search for type-II WSMs in compounds like WTe₂ and MoTe₂, where the Weyl cone is strongly tilted, leading to different transport and optical properties compared to type-I WSMs. Additionally, the article highlights the multifunctional nature of Heusler compounds, which can exhibit both topological insulator and WSM properties. The authors emphasize the importance of precise control over material parameters to realize topological phases and discuss the potential applications of WSMs in high-speed electronics, spintronics, and catalysis.